Corrected entry: After Dylan interrogates the Frenchman, he goes to the fridge and gets a soda, then walks toward the other interrogation rooms. In the very next shot, he has a bag of chips instead.
Corrected entry: Cowan disappears from the truck from when Fuller shows the video to when the truck is backing up for placement. He wouldn't have gotten out of the truck as he wouldn't want the Horsemen to know it was being staked out. He couldn't be on the side of the safe as he wouldn't fit on either side. (01:22:35)
Correction: After the agents appear and Dylan and Fuller get out of the truck, Cowan is beside the other agents so he did in fact get out of the truck between the time the video was shown and when the truck parked. Enough time had passed for him to get out when they were nowhere near 5 Pointz for him to make sure the coast was clear.
Corrected entry: During the Las Vegas show the Frenchman is asked to sign his name on a card. This card is shown two more times and neither looks like the first signature.
Correction: That's how the trick is done in real life, the magician doesn't use the same card he had the spectator sign. In the film, they've been following the Frenchman and knows how he signs things. Then they forge his signature on a card and use that card during the trick. And it's not hard for a magician to "force" a spectator to pick a specific card, which is what's done in the film. You see this type of trick on shows like America's Got Talent where the magician has a judge sign a card but then he uses a different card and you can see the signatures don't match.
Correction: When he is walking away from the fridge we see him holding the top of a potato chip bag with his left hand against the soda can he is opening, and in the later clips until he enters the mentalist's room he continues to have both a soda and a bag of chips.