Revealing mistake: When Blackout is destroying the base in Qatar, a few Humvees get flipped over, and none of them have engines in them. (00:07:00)
Revealing mistake: At night, when Sam's car is running away by itself, you can see out of the windows that it was filmed in broad daylight. (00:33:45)
Revealing mistake: When Sam flips over on the bike, in one shot you can see that it is a stuntman who looks much older than Sam. (00:47:55)
Revealing mistake: In the final battle, Captain Lennox is going to shoot Blackout. He gets on a motorcycle, goes really fast, and then slides off the bike and down the street. While he is sliding, he shoots Blackout. When Lennox gets to his feet, you can see his back, and his shirt is not worn away at all. It isn't even discolored.
Revealing mistake: When Mikaela and Sam are in his car when he gives her a ride from the lake, both windows are open but her hair doesn't blow around at all - like it would if they were really open. (00:23:00)
Revealing mistake: When Blackout sees the green laser light on him, he turns around and flips over some cars, a couple of which don't have engines in them.
Revealing mistake: Near the beginning Shia and Megan Fox are driving in Bumblebee, before it breaks down. There is no road shown in this entire scene, no matter which angle you see. No landscape either. This indicates the scene was probably shot on a soundstage and the car was not moving. It is also obvious there is no wind coming in through the windows.
Revealing mistake: When Ironhide shouts, "Incoming!" as Starscream fires on them, Lennox and Epps are blown backwards and slam onto the ground. The shot of them hitting the ground and the next close-up of Lennox are flipped shots. Note the reversed 'Broadway Bar' sign and Lennox's watch. (01:53:45)