Continuity mistake: When Mystique is on the exercise table and Erik lifts the bar off her, her right leg changes from stretched out to bent from the different camera shots.
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 John sees his photos on Sarah's website, the lower row of photos shows him throwing a football. However, when Sarah took those photos earlier, she only took out her camera AFTER he threw the football, while John was already talking to Sam.
Continuity mistake: After meeting Elise on the bus and getting his Blackberry dumped into his coffee David Norris calls his friend Charlie with his "spare phone" (silver). But after a cut or two you can see that he uses his BlackBerry again. So he has changed the phone during the conversation AND his coffee BlackBerry seems to be working again. (00:19:20 - 00:20:10)
Continuity mistake: After the train wreck, one scene shows the car they came in has a steel or wooden beam/bar stuck into the rear wheel area and debris is piled close to the car - yet when they get in it to escape, the car is clear and they easily pull out of the lot. (00:19:25 - 00:24:35)
Continuity mistake: After Steve throws Heinz Kruger, the assassin sent to kill him, out of his boat, both Steve and Heinz are bone dry despite being fully submerged in water only moments before.
Continuity mistake: When the bird first hits the RV, a blood stain is visible on the windshield. But on the exterior shot of the RV as it stops, the blood has disappeared. (00:26:50)
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: In the 1982 movie, the alien ship is uncovered by the Norwegian scientists using thermite. (As seen on the films discovered by the Americans.) In the 2011 movie, it is uncovered when the Thing gets back into the ship and starts up the engines.
Continuity mistake: When Sylvia shoots Timekeeper Leon, the S&W 945 in her hand has a magazine inserted into it. But in the next shot where she quivers and rushes over, the magazine is gone.
Continuity mistake: During the film, Daniel Craig's character rides out to the house where he last saw the woman he was in love with. During the wide shot showing him on his horse riding toward the camera, the device on his wrist is missing. It is obvious if you are paying attention, as he is using the arm which is supposed to have the device to hold the reins of the horse.
Continuity mistake: When Tick Tock freezes Rebecca and Cecil, they are in one position, and when they go to the close up of them frozen, they are in a different position. When it zooms back out again they are in the first position. Also, when they are frozen moving on the conveyor belt, they are back in the position they were in on the close up shot. (00:47:50 - 00:48:10)
Continuity mistake: During the first round of the Zeus versus Atom fight, as Atom gets knocked down for the third time he initially falls onto the very edge of the WRB logo in the centre of the ring. Yet as soon as the camera changes angles Atom is lying much further in on the logo.
Continuity mistake: During the final shootout, there is a shot of Nantz firing his handgun. A few shots later, Nantz pulls out his handgun and begins firing.
Continuity mistake: When Hal is showing his friend how the ring works and has to "recharge" it, his grip on the lantern changes between shots. (01:09:45)
Continuity mistake: When the trio are about to enter the maintenance tunnel under the cargo hold, there is nothing in the tunnel. Morgan tosses a single bag in to start crawling through it, but she crawls over another bag already in the tunnel. (00:57:30)
Continuity mistake: When a guy brings flowers to mourn for Mitch's wife, he is in the kitchen, stands up and runs to the door. When the angle changes, a frame later, he repeats all the previous movements.
Continuity mistake: Multiple scenes: On every exterior shot of the train, you can only see one row of windows across the upper galley section. However, whenever there is a scene shot on the upper 'galley' level, there are two rows of windows, one right above the other. The external shots were filmed using a Chicago Metra train (which uses 'bilevel' galley cars), the internal scenes were filmed on a set in Montreal, Canada.
Continuity mistake: Kiefer Sutherland throws the suitcases a few steps in front of the middle of the stairs of the entrance of the house but when someone else picks them up, they are on a side of the stairs and close to them. (00:32:45 - 00:33:40)
Continuity mistake: Charge gets to the laundry mat first, and sees a TV on. He sets his map down in front of it, and the close up of the map shows the TV is suddenly off. (00:07:25)