Question: Me and my friend have debated this each time we have watched the movie and I finally decided to ask the question here to see who is right. When they are discussing their plan and saying they need the plane for it, Saito says "I bought the airline... It seemed neater." My interpretation of this is that he bought out all the tickets on that particular flight so the plane would be empty and weed out risk of interruption from other passengers, as doing that made it so there are no other passengers. But my friend thinks he means he bought the entire brand of the airline, so that he now owns the company that has that plane. Like buying out SouthWest Airlines as a company or something. So who is right? What did Saito mean? Did he buy out all the tickets for that flight, or did he buy the whole airline company?
Quantom X
Chosen answer: He bought out the actual airline company. If he'd bought out all the tickets for that specific journey he'd have said "I bought out the flight" or similar. It's a deliberately over the top moment of exuberance to highlight exactly how rich Satio is. I'm afraid that it is your friend who is correct, sorry.
MankyQuestion: How do the people in the film share a dream? I understand that the briefcase contains sedatives to put everyone to sleep, but how do they get inside a certain individuals dream? How do they end up being in the same dream together?
oo0O0ooChosen answer: The details are never explained in the depth, but all the dreamers are connected via the briefcase, so it seems likely that the briefcase acts in some way as a networking hub for them to share the dreamspace.
Tailkinker Question: What is the hotel used in dream level two?
Answer: The hotel is made up of several locations, most of which (the hallway, the hotel bar, the room) were constructed specifically for the film on a soundstage.
Question: When Cobb finally gets home to see his children at the end why don't they look any different from his memories? The story implies that he's been gone for a long time yet they don't appear to have aged.
Answer: The story really doesn't imply too heavily exactly how long Cobb has been on the run. Very few clues are given, so it could quite plausibly be less than a year since his wife's death, in which case their children would not have aged dramatically. Their voices on the phone seem compatible with children of the ages shown at the end of the film and Cobb shows no concern when reunited with them that they should be older than they are. Two sets of children are listed in the credits, of different ages.
Tailkinker Question: What is the point of so many dream layers to get to the "inception" of the idea? I guess the movie would lose all of its intricacy without it, and would be much less appealing. So what is the excuse to use that trick from the director?
AnthonyAChosen answer: For inception to work the idea must be planted very deeply within the subconscious. The more dream layers there are, the deeper into the subconscious you get.
Phixius Question: In the beginning of the movie, we see Cobb and Arthur get mad at their first architect for not knowing about the wool rug in Saito's "love nest." But further on when Ariadne joins up and they are hiding from the commandos from Fischer's subconscious, no one blames her for not knowing about them beforehand. Since the architect is supposed to know everything about the level she/he built, so why do they blame Nash?
Answer: The architect builds the levels, they don't populate them. Nash screwed up in a physical detail of the dream, the composition of the rug, which is the role of the architect, so he gets into trouble. Ariadne only designed the dream's architecture, the inhabitants of that dream are all formed from Fischer's subconscious and thus are not something she has any control over. Arthur was the one who was detailed to research Fischer's background, and thus should have picked up that he had been trained in the anti-intrusion tactics that manifest as the armed security force. He somehow missed it, so they get annoyed at him for putting them all in danger.
Tailkinker Question: In the vault scene, isn't forger Eames impersonating the Elder Fischer on his deathbed in the vault? If so, then how can he also be across the room at the door?
Answer: No, he isn't. Everything in that room is out of Fischer's subconscious - as the film explains, the team design the dreams to include a secure area, a vault, safe, whatever, which the target will then fill. In the higher levels of the dream, the team have been surreptitiously guiding Fischer towards the idea of splitting the company up; this is the level where it pays off, where Fischer's own subconscious fills the vault with the things he needs to see or hear to make the idea real, to complete the inception.
Tailkinker Question: How can Cobb be accused of killing Mal when she was on a ledge across from the hotel suite?
Answer: The gap between the window Cobb is in and the ledge Mal is sitting on doesn't appear to be particularly wide, so it would be unclear exactly where she fell from; if she was physically thrown from the window, which is the scenario she's trying to fake, she wouldn't fall straight downwards, so a position some distance out from the window would not be unexpected. Add to that her stated claims that he threatened to kill her and the very obvious signs of a struggle in the room, to say nothing of the fact that Cobb ran, and he comes out of the whole sad affair looking extremely guilty.
Tailkinker Question: I mostly understand the nature of the "kicks", but one thing I don't understand is what the kick was that woke the characters up from the 1st dream layer, the one with the van falling off the bridge. Falling off the skyscraper woke Ariadne up in the snow fortress layer, the fortress collapsing woke them up in the hotel layer, and the elevator crashing woke them up in the van layer. What woke the characters up, all at the same time, in the van layer?
Answer: You've got it a bit backward. Falling off the skyscraper (dying) got her out of limbo and back to the snow fortress so that when the elevator crashed at the hotel, THAT kick would be able to wake her out of the snow fortress. Then the van crashing woke her from the hotel, and finally the time entered into the dream machine itself expired and woke them all simultaneously for the final time. The only ways to wake up are to die within the dream or receive a kick from the level above the dream you're in, whether that's in another dream or the waking world.
Phixius Question: Fischer has been trained to resist dream invasions, which means he is aware that this technology exists and has had experience using it. Why, then, when he wakes up on the plane, does he not remember everything as having actually happened for all intents and purposes in the same way the team does? Why does he simply look as though he's just woken up from a very strange dream when he really ought to know full well that it was not "just a dream"?
Phixius Question: Does anyone understand how the function of the architect works? As told in the movie, the architect creates the world of the dream, and then the subject is brought into that dream and fills it with their subconscious. So doesn't that mean the architect must be the main dreamer, with the subject and others acting as the participants of that dream so that the architect can set the infrastructure for the subject to populate? Otherwise, the story would need to explain how the architect has the power to override the dreamer's dream framework.
Teru_KageChosen answer: The architect designs all of the dream layouts then teaches those layouts to the people who will be the main dreamer for each level. They could be the main dreamer on one of those levels, but by having the architect teach the layout to different people, that means that the architect can move into each successive level along with the group and you can always have someone in the group who is very familiar with the layout of each dream level.
Garlonuss Question: I've got two questions. 1. I still can't understand how the kick works. When the van was falling, why they didn't wake up from the hotel? When they fall they should wake up from the dream. 2. Why the loss of the gravity didn't affect the 3rd level, if the other factors, such as the music or kicks actually affect it?
Honza PožárChosen answer: 1. The sleeping ones in the hotel were in the third level and the kick wasn't strong enough to affect them all, and Arthur made the dream, which gives him some control of when it ends. 2. The lack of gravity in level 2 DID affect level 3 with the avalanche. The gravity change in two might have made them a bit lighter, but not catastrophically so. And the music and the kicks were on the previous level, so they could get through.
Question: When the team is twice under, I think, the bus, with all of them on it - the reality - is heading for water, it has been hit. But what I don't understand is how Cobb says, "When the van hits the water," how would he know this? He's dreaming, as they all are.
kh1616Chosen answer: When the van hits the water it will suddenly stop, giving a kick to the passengers. Cobb knew because driving the van off the bridge was always the plan.
BaconIsMyBFFQuestion: Cobb starts to say to Ariadne, "There's something you should know about me." But he never finishes. What does he want to say?
michaelmcbrd8Question: Cobb tells Ariadne that his wife buried something deep inside her and never let it out. What was he referring to?
Answer: She buried the truth that she was living in a dream. She'd chosen to make the dream life her real life. She did it by hiding the totem (which is what they use to distinguish reality from dream) in a safe box.
Garlonuss Question: Near the end of the movie, when Cobb is home, he gives his totem a spin and it shortly starts to decay in its spin. Then as the movie ends it pans to his totem still spinning smoothly but then it starts to wobble again. So, what are we suppose to conclude? Is it left intentionally ambiguous?
buchsChosen answer: Yes, it's an ambiguous ending, so we can conclude whatever we want, based on our reading of the film. There are plenty of theories around the internet, so feel free to have a read and decide which one works best for you. However, according to Christopher Nolan it is supposed to signify how Cobb is leaving the dreams behind and doesn't care.
Tailkinker Question: Towards the end of the movie my husband thinks he saw braces or at least a retainer wire on the girl who plays the architect. Has this been seen by anyone?
Answer: No. She has no retainer or braces throughout the movie.
Question: Can someone please explain how each and every totem works? We understand that Cobb's will not stop spinning if it is a dream, but how does Arthur's and Ariadne's work?
Answer: No details are given within the film. However, Arthur's totem is a loaded dice, so it seems logical to assume that it will always come down on a specific side, one that only he knows. As for Ariadne's chess-piece, we only see her working on it, never using it. Probably it has some specific and unusual weighting built into it, allowing her to determine, in some unspecified manner, maybe by tipping it to a certain angle, or simply by feel, that it's the genuine article.
Tailkinker 
Answer: He doesn't wash up on the shores of limbo a second time, he has been searching for Saito in limbo and wound up on the beach outside of the compound that Saito created. His exhaustion, haggard appearance, and confusion suggests that Cobb has been searching for Saito in limbo for years.
BaconIsMyBFF