Revealing mistake: When Mikaela is driving the Saturn she's wearing a long sleeved leather jacket, yet when Grindor shows up in front of them and the car spins, the driver is wearing a short sleeved t-shirt. (00:54:00)
Continuity mistake: The Saturn that Mikaela is driving has a moonroof that encompasses most of the roof, over the front and back seats. When the Decepticon Grindor captures them, in the interior shot looking up at Leo as Grindor seizes the Saturn, the car has a solid roof over Leo, which is also seen in the interior shot as they fall. (00:54:05 - 00:55:05)
Continuity mistake: When Mikaela deliberately rams the Saturn into the pole, in the front shot both headlights are perfectly intact after the impact, but in following shots the car's left headlight is gone. (00:54:40)
Continuity mistake: When Grindor seizes the Saturn, Sam falls out of the door and in Mikaela's close-up Leo's arm hangs out of the rolled down back window, but in the next shot that window is rolled all the way up, only to be rolled down again in following shots. (00:55:10)
Revealing mistake: In the scene where Grindor lifts the car with Sam, Mikaela, and Leo in it, at the part where Sam is hanging from the door of the car and then lifts himself back up, you can see the stunt man's face. (00:55:20)
Continuity mistake: When the Saturn has been dropped by Grindor, as the car falls with Mikaela, Sam and Leo inside, just before they crash land in the last interior shot, Mikaela's and Sam's headrests have vanished, and a large sticker has also suddenly appeared on Sam's visor in this shot. The headrests reappear when they are upside down. (00:55:35)
Revealing mistake: When Grindor drops the Saturn with Mikaela, Sam and Leo inside, in the side shot as the airbags deploy, the stiff, shiny mannequin dressed as Sam is much too obvious through the open window. (00:55:40)
Revealing mistake: When Sam is standing on the stairs with his hands up, just before Megatron grabs him and throws him onto the table for the 'Doctor', the rail and balusters in front of Sam have been set up to easily break for the stunt - note the short diagonal bits of wood propped up between them, precisely where they break for the grab. (00:56:10)
Continuity mistake: When Megatron sarcastically asks Sam, "You remember me, don't you?" Sam stops on the landing between the two flights of stairs and puts his hands up, but in the next shot Sam, whose hands are still in mid-air, is standing much farther down on the second flight of stairs. (00:56:10)
Continuity mistake: After Sam's rescue from the Decepticon doctor's brain surgery, when Optimus transforms we see Sam rolling on the ground near the trees and in the next shot he gets up and runs behind the trees as Optimus shouts, "Hide, Sam!" However, in the next shot Sam is still rolling on the ground. (00:59:20)
Revealing mistake: When the battle between Optimus and Megatron first begins, Optimus pulls a dead tree out of the ground, without branches and needles but still standing upright in its basic conical shape, and uses it to beat Megatron. The latter one deflects the attack by pushing it into another tree, the one where Sam in covering behind. When it hits that particular tree, you can see that the end of the tree is perfectly straight, as if it was cut by a saw rather than pulled out of the ground. (00:59:40)
Continuity mistake: During the forest scene where Optimus Prime is engaged in a battle to the death, Sam is scrambling for safety. In some of the shots both of his hands are uninjured, but in other shots you can see that his left hand is bandaged/splinted. (This is a result of his "real life" injury in a car accident during filming.) (01:00:05)
Continuity mistake: When Optimus is shot in the battle in the forest, he loses one of the chrome bumpers on his chest, and the other one is heavily damaged. The latter one is attached to HIS right side. But in the shot where he says: ''Sam. run.'', the bumper is attached to the left side of his chest. (01:01:15 - 01:03:05)
Continuity mistake: When Megatron stabs Optimus through his back, Optimus' elbow is scratched, but clean. When Megatron lifts him, there are big chunks of grass on his elbow. (01:02:20)
Visible crew/equipment: At the scene where Optimus Prime's body is getting back to base and suddenly got surrounded by US marines, after the shot where Major Lennox objects and beats on the hood of a Humvee, you can see a cameraman's shadow on him in a panning shot. Some shots later you can see it again on Galloway's body in an over-shoulder view. (01:11:10)
Revealing mistake: When Major Lennox is being sustained by Galloway and Master Sergeant Epps says that he's an "Asssshole!", you can see bunch of soldiers and Autobots in the shot. Sunlight is almost in the middle of the shot; the problem is just the body of the soldiers blocks it. If you watch it closely you can see first a soldier with hat blocks sunlight, after that an Autobot should block it but it doesn't. Again a soldier comes from left to right and blocks it and after that an Autobot should have blocked it, but still you can see the sunlight. (01:12:20)
Continuity mistake: When Sam, Mikaela and Leo arrive at Simmons's deli, in the exterior shot the deli has a single front door with its glass covered, and bars on the store's windows. However, when Sam walks in and when Simmons tries to walk away from Sam, we see there are double front doors with a meat poster on one, and there are no bars outside of the store's window. (01:14:55 - 01:16:30)
Factual error: In the battle between Decepticons and Autobots, the battle is around a Jordanian temple. Supposedly it's Petra temple, with the Egyptian pyramids only couple of miles away. In fact, the distance between the two monuments is more than 250 miles. (01:15:00 - 01:40:00)
Continuity mistake: At the deli, when Sam, Mikaela and Leo are talking to Simmons, his mother shouts, "Moron, where's the white fish?" and there are four cans on the meat counter, but when it cuts to close-up there are only three. (01:16:10)
Continuity mistake: When they're all in the secret room below the deli's meat locker, Simmons places the photos of the symbols in China, Egypt and Greece, and their positions change in the consecutive shots. (01:17:40)
Chosen answer: He knows from stories passed down to him from older generations of bots, not much unlike stories about the past passed down to us from our ancestors. His line about no one telling him anything is just a way to avoid being put back in the box or being tortured by Mikayla.
dablues7