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Revealing mistake: When Optimus returns from the dead, he says: "We will kill them all.". The same footage is used when he makes his speech with: "your leaders will now understand", only it's cut slightly shorter.

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Continuity mistake: When Optimus takes the roll to avoid getting shot by Shockwave, you can see the very distinct clock of the Hotchkiss building can be seen in the background, yet they aren't fighting in front of that. In the next shots, the building in front of which Optimus rips out Shockwave's eye is much more modern.

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Continuity mistake: Just before Optimus Prime arrives in the street where he kills ten Decepticons in twenty seconds, there is a shot of Sentinel saying "It's our world now!", and he is looking out over that same street. When Sam comes out of cover to take a look at Cybertron, Sentinel is still on the building. But when Sam shouts "Optimus!" Sentinel is gone.

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Continuity mistake: When Carly nearly reaches Megatron, there is a slow-motion shot of her with an SUV blowing up in the background. In the first shot, it flies up in an upright position. In the second shot, it suddenly spinning.

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Revealing mistake: When Dino (Mirage) throws Hatchet over to the other side of the freeway, Hatchet doesn't even make the security van right next to the car he crashes move, while he should have. His arm is basically going right through the van.

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Continuity mistake: During the freeway chase, there is a shot with Hatchet landing on a car on the opposite side of the freeway. This shot has all sorts of poles on the center guardrail, and structures in the background. Then the poles in the center disappear, and the white-ish buildings in the background change into a bridge.

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Continuity mistake: When Sideswipe kicks the gun towards Ironhide, the latter one catches, turns, locks, aims and holds the gun still all in the same motion. The nest shot has him do the same again, only this time he keeps on turning.

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Continuity mistake: When Crowbar dropped his weapons in the ''Mexican stand-off'' we get a look at his ''dread locks''. When he pulls the spike which he throws at Ironhide, the locks disappear, only to return in the subsequent shots.

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Continuity mistake: After Ironhide crashes into the two remaining Dreads, both of them transform. We get a close-up of one of them, who transforms over a lamppost, about 10 feet above it. The next shot has him past the lamppost, and at the same height as the lantern itself - instantly.

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Continuity mistake: During the freeway chase scene, Bumblebee widens his tires considerably for better braking abilities. In the next shot, the rest of him/the car is instantly semi-transformed.

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Continuity mistake: In the NASA radio room, There are two men standing beside a cabinet. One a white shirt and tie, the other in a full suit. When the shot cuts, they have instantly switched sides, and the one who doesn't wear a jacket, suddenly is wearing glasses. (00:05:20)

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Continuity mistake: After Sam and Carly are reunited, her hand keep altering from being very dirty and in Sam's face, and clean in Sam's neck.

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Continuity mistake: When Optimus dives in front of Shockwave, there is all sorts of rubble around the latter one. In the shot of the bullet arriving at the cupola, all of the rubble, damage to the street and broken cars are gone.

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Continuity mistake: When the newscaster is introducing Simmons via his book, at first, he holds the book at the bottom, but in the shot directly afterwards, he holds it by the side. (00:54:15)

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Revealing mistake: When Bumblebee skids out of control after dodging the truck with the barrels in it, you can see skidmarks of a previous attempt. Same place, same direction. (01:08:15)

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Continuity mistake: When the guy in the back seat gets out of Epps' car, he is wearing a baseball cap and a Motley Crüe t-shirt. In the next shot, he is wearing full tactical gear - instantly. (01:37:15)

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Continuity mistake: When the Dreads knock over the freeway sign, the distance between the two green signs keeps varying.

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Question: How did the Decepticons bring something as big as the Driller on Earth unnoticed? It's an earthworm the size of a building. Also, Megatron got here on purpose, Sentinel got here by accident, so did the original Seven Primes, so that would be an extreme number of coincidence. And even if that thing had been here for all these years, how did it manage to stay hidden? It's not like it can transform into something a little more subtle like a car.

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Continuity mistake: After Optimus saves the day by shooting the Decepticon hovercraft, we get a small speech. When he says: ''For today, in the name of freedom'', his gun disappears. We never hear him throw it away, or see it lying around when Bumblebee transforms. (01:39:50)

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Revealing mistake: When Optimus uses the Shockwave cannon to bring down the cupola with the control pillar in it, the cupola starts falling before the bullet hits the building.

Friso94