Question: Why type of propulsion system does the Endurance use? It took 2 years for them to reach Saturn from Earth. Once they're in the other galaxy, the ship appears to travel between planets in mere hours/days. Also, it appears that the smaller shuttle craft was launched from Earth on a Saturn V type rocket, but later when leaving the surface of other planets, they have no such system.
Question: When Cooper is walking into Murph's hospital room (when Murph is on her deathbed), why do her family members appear to completely ignore him? Not even a "hello" or any kind of acknowledgement of his presence. You would think that because of what he accomplished in saving the planet or the fact the he is the reason all those people in the room even exist would garner some type of attention.
Question: When the crew gets struck by the gigantic wave on the Miller's planet, CASE is shown to be able to morph into a wheel-like form, and rescue Amelia. If CASE is actually that fast, and that "versatile" to hold things while running, why can't he actually just move around the surface, and survey the wreckage of Miller's ship. That would have saved a lot of time, wouldn't it?
Question: SPOILER ALERT: What exactly happens in the end, does Cooper actually die and the Tesseract and the Cooper station were just parts of his dream? Please let me know if I might have missed something because the explanation that he travels back through the wormhole to Saturn does not make sense to me. He must have been sucked inside the Gargantua and died, surely?
Question: If the wormhole was sent to help the human race, why put it out by Saturn? If it was meant to encourage humanity to redevelop spaceflight, it could have done that closer to earth.
Question: How are the waves on Miller's planet so big, and how could you get waves that big in what looked like 3 feet of water?
Question: While en route to Miller's planet, Romilly explains that due to relativity, for each hour they spend on the surface, 23 years will have passed on earth. Romilly stays aboard the ship, orbiting the planet. The crew goes in, has a tragic accident, then goes back to the ship. Now, this is what I don't get - Romilly has aged 23 years while they explored the planet for a couple of hours. How come Romilly aged at all? He was just outside the planet. Not on earth. There should be no major time difference between the crew and Romilly.
Question: How exactly is the artificial gravity created on the Endurance? If it is due to the centripetal force created by the rotation, then isn't the gravitational force supposed to make them stand normal to the edge of the circle, considering the outward direction of the centripetal force?
Question: When they're discussing which planet is the best option because of low fuel I spotted what looked like snow falling out the windows. What is it?