Continuity mistake: In the scene on the Golden Gate Bridge when the apes are pushing the bus, the police shoot the bus numerous times, but when the camera goes off the bus and then shows the bus again (twice) the bullet holes are not there anymore.
Continuity mistake: Carly's shoes appear to mysteriously alternate several times between black stiletto heels and black ballet flats in-between shots during the climactic action sequence. This is most noticeable during the collapsing building sequence as well as the scene in which Carly speaks to Megatron.
Continuity mistake: When the young mutants are showing each other what they can do, they all have a glass of cola, all four sitting on a corner of the table. But when Banshee wants to show what he can do, the glasses are instantly lined up. (00:51:00)
Continuity mistake: When Lucy comes home at the beginning of the movie she quickly buttons the top of her dress. While eating dinner, it is open and then buttoned again between shots.
Visible crew/equipment: During the attack on the town, right after Jake breaks Percy's hand to get out of the cuffs and begins kicking the wagon door we see an exterior shot of two people running and just before one does a flip, film crew is visible on the left. We see at least two people sitting in chairs, one wearing a bluish short sleeve shirt, shorts, and boots, and another in a white shirt wearing a baseball style cap. We also see a blue light coming off their equipment. (00:35:30)
Continuity mistake: When the woman is writing on the whiteboard how many people people infect with certain illness' the writing on the board changes style. (00:18:40)
Revealing mistake: When Wil is showing Sylvia how to shoot, and she fires, Justin Timberlake can be seen wearing earplugs. When the scene cuts, he no longer is wearing them.