Plot hole: In the beginning of the film the Fallen is nearly barely able to live. Jetfire explains that without Energon, Transformers will "oxidize and rust, like my wretched self!". But after Optimus dies, the Fallen is suddenly able to do serious combat. Where did he get that new energy from, when The Matrix of Leadership is said to be the only remaining source of Energon?
Factual error: During final battle after Optimus' resurrection, the battle scene moves from the pyramids (located near Cairo) to the Karnak temple (located near Luxor, more than 1000km from Cairo) and back.
Continuity mistake: During the shot where Mikaela runs into the lamp post, both the Pretender and the front bumper slide under the car as she backs up and drives forward again. Seconds later, as the camera angle changes and they drive away, the front bumper is re-attached with only a dent where it hit the post.
Revealing mistake: As the two main characters are running down the sand dune, you can see the darker sand of the previous takes where the director has raked down the sand so as not to show the foot marks in it.
Factual error: During the credits, Tyrese Gibson's character is listed as USAF Master Sergeant Epps. However, throughout the whole movie, Gibson is seen wearing the sleeve chevrons of a CHIEF Master Sergeant. Chief Master Sergeant is the highest rank an enlisted person can hold and is NEVER referred to either verbally or in writing as Master Sergeant. Master Sergeant is a different (lower) rank.
Continuity mistake: During the scene establishing the Decepticons on the Bayos freight ship, vehicles change. The first shot, overhead, shows Long Haul (green dump truck), MixMaster (grey cement truck), Rampage (red bulldozer), and Scrapper (yellow front loader with wheels). The next shot shows Rampage as being yellow, and Scrapper is now some yellow Volvo vehicle with treads and a claw. Also, by the angle of this shot and based on the previous shot, there would not be an angle to see through the background vehicles. In the next shot, when the transformers jump overboard, Rampage is red again, and the Volvo with treads is now the front loader Scrapper again.
Revealing mistake: During one of the shots in which the Pyramid of Giza gets destroyed, one of the falling rocks does not spin. During the fall, the rock bounces without spinning when touching the surface of the pyramid. It seems just to "hover" down.
Continuity mistake: After the Astronomy class, when Sam is in his dorm room he begins writing a green symbol on the Bad Boys poster, but when Leo and Alice show up that first green symbol has completely changed its shape and its position on the poster.
Factual error: When the Decepticons are reviving Megatron in the Laurentian Abyss, sunlight can be seen filtering down on them. The Laurentian Abyss is too deep for sunlight to penetrate.
Factual error: When Starscream and Megatron are shown talking after Sam has escaped, they are supposed to be in New York City. They are actually on top of the "Gas Company Tower" which is in Los Angeles.
Continuity mistake: When The Fallen decrees that the Decepticons will now make their presence known, one of them knocks the flagpole off the top of the eastern tower of the Brooklyn Bridge. A short time later, another shot of the tower shows the flagpole is back and there is no damage.
Continuity mistake: When Megatron heads toward the tower in jet mode, he transforms and seen upside-down front flipping towards the tower before he lands. About a split second when he lands, he faces the other way instead of facing the tower.
Revealing mistake: In one of the first scenes with Devastator 'inhaling' everything in sight, there is an SFX shot of some random bystander hanging on for dear life, then losing his grip and being sucked in. During this shot you can see the matte halo around the person as they flail and 'fall'. It is especially noticeable given the general high quality of the effects in the film: by contrast this looks like a cheap effects shot from an old movie.
Factual error: Aside from the lack of an Air Force base in NJ that looks anything like the one portrayed in the film, there are no mountains anywhere closely resembling the ones seen in the distance by the base.
Continuity mistake: When Leo, Mikaela and Sam arrive at Simmons's deli in Brooklyn, note the clock hanging on the wall behind the counter. Between shots the time changes from 10:20 to 11:40 to 1:05.
Factual error: Mikaela hotwires the silver Saturn Astra at the attack at the university. Firstly, she doesn't break the physical steering lock, and secondly, this is impossible to hotwire. It requires a signal from a chip in the ignition key that transmits the signal to the ECU to enable the car to start.
Factual error: The F-16s performing close air support were loaded with orange-colored "captive carry" munitions. These are used for maintaining weight balance on the wings, and are not weapons.
Factual error: During the Decepticon attack on Paris, there is a shot of the Hotel Crillon with the Eiffel Tower in the background. The tower is actually on the opposite side of Paris, making this shot impossible.
Factual error: When Optimus is killed, the fight takes place in a mountainous forest with that was filled with extremely tall trees not indigenous to NJ, much less any surrounding state of the area portrayed in that scene.
Continuity mistake: When Major Lennox throws Galloway off the cargo plane, Optimus Prime's dead body disappears.
Answer: After the tomb, he doesn't appear onscreen again. There's no indication as to what happened to him.
JAGwire