Continuity mistake: When the Colonel finishes talking to the General on the phone, he practically throws the phone into the army truck out of frustration. In the following shot, you can see the soldier in the truck with the phone in hand, as if it was calmly given to him, even as you hear the end of the "clunk" from when it was thrown. (00:52:50)
Continuity mistake: When Po is killed by the NVA it is the middle of the night, Captains Cahill and Doyle are close enough to the village to hear the shots and rush back to the village but as they enter the village it is early dawn.
Revealing mistake: After Nicole has showered and she is getting out, you can see that she is wearing underwear as she is stepping out, to protect her modesty.
Continuity mistake: In the opening football scene, when Angus makes a tackle, the football clearly falls to the ground. In the next shot, however, it is seen soaring through the air.
Continuity mistake: Peter's hair position changes when he says the famous line, "Did you get butt-fuc**d in prison?" and after John replies "It only hurts the first time".
Factual error: Throughout the film they show exterior shots of Alcatraz. If you pay attention you can clearly see that the Warden's house is destroyed and all that remains is a shell. Also there is only 1 guard tower. Alcatraz had many guard towers but they were destroyed in the seventies by fire. The movie takes place in the late thirties.
Revealing mistake: Near the end of the film Willy jumps on a barrier in the water, causing it to break. During that scene its clear that the orca has been pasted into the background as the outline is too sharp.
Continuity mistake: When JC is in the car with his friends, he says Chloe has no money and between shots his collar jumps from under to over the seat belt.
Continuity mistake: One whole day of the week is missing. The rain begins on Wednesday night, but the narrator has the rain beginning Thursday night. All of Thursday is missing.
Continuity mistake: When Max is running out of the school after successfully becoming cool. We see his friend with the orange mohawk at least twice. Once hanging from a statue, and another where he's reaching out from a school bus. These two shots are really close together so there is no way that he could have moved that quick.
Continuity mistake: In the scene where the two police cars are chasing the truck, the two police cars crash into each other and explode - as soon as this happens the truck mysteriously disappears.