Revealing mistake: When the hiker's body is taken out of the cottage, it is so obviously a dummy - you can see the join in the neck.
Revealing mistake: As Joe is gesturing, the wrinkles of the gloves worn to make his hands bigger are noticeable.
Revealing mistake: When they (Finch and Frank) are on the boat to Ecuador, in the first shot you can see on the waves that the boat had sailed in what seems like a circle. (01:16:30)
Revealing mistake: When Dylan is looking at the news articles in Thaddeus' cell, the camera pans over to one of the articles with the headline, "I am a victim": Thaddeus Bradley. The opening paragraphs on the first column are repeated throughout the entire article.
Revealing mistake: Towards the end of the movie, the principal puts on his hat which turns his hair green. But you can see the green paint has already been applied before he puts his hat on.
Revealing mistake: When Branch first takes Poppy into his bunker, and down into his storeroom, the lever that he uses isn't there, but when the shot goes to Poppy, and then returns to Branch, the lever is magically there.
Revealing mistake: When Gabby and Fin are hanging off the building in Las Vegas, you can see that Gabby isn't holding on to anything in some close-up shots. (00:11:47)
Revealing mistake: When James jumps off the SUV about to crash through the parapet, Ice Cube rolling on the floor looks 20 pounds lighter - that, or it's just the stunt double. (00:09:30)
Revealing mistake: As Pee Wee rides in his little red car he stands up in it going by the breakfast bar in the house. As he sits after filling the plate, the camera shakes along with the car, showing the car and camera are mounted on the same rig.
Revealing mistake: They jump out the office building and the CIA is shooting at the tan Ford Explorer. When the bullets hit the drivers door and other parts they are not making any marks/bullet holes, you can see they are fireworks and not bullets.