Question: Megatron was brought back through the body of Galvatron because his head was recovered, although Optimus Prime previously stated that Transformers' memories are stored in their Spark in their chest. Wouldn't this mean Megatron would not have any of his memories from before?
Question: Twice in the film, Bumblebee is shown turning around and a close up of his license plate is show, reading 900 STRA. Is this a reference to anything?
Chosen answer: There is no reference. 900 STRA was just the number plate of the car he adapted from.
Question: Why is it that BumbleBee still can't talk?
Chosen answer: It's not 100% clear if it's his "natural" voice at the end of the first movie or just the radio, but the other movies imply he's either able to talk but prefers to use the radio, or that his voicebox was only partially repaired, and still malfunctions.
Question: Where is Sam and why is he not in this movie?
Chosen answer: It's not explained where he is. The most likely assumption is that he is probably married to Carly living somewhere. He is not in the movie because it is mainly the choice of the writers to not have him in the movie.
Question: When Prime leads the Dino bots into battle with the prototypes, how do the Dinobots know not to attack the Autobots or how to distinguish between them and the prototypes?
Chosen answer: Easy answer, the prototypes are shooting at them. It's easy to tell who the bad guys are.
Question: How exactly did Optimus wind up in a beat down theater in Texas? Didn't they say the ambush that he escaped from was in Chicago? If he was hit by the missile there, or wherever it was that he was hit, how did he get to that theater in the middle of Texas and some how wind up inside. It seemed by how he reacted when he was revived that he was still in the heat of it when he went unconscious from the attack, and didn't get to the theater after the fact to just fade away. So how?
Chosen answer: The battle that lead the government to hunting all transformers was in Chicago, but the incident that took Optimus out of commission was not. He'd been on the run for however long, even changing his appearance to avoid detection, when he was ambushed. Wounded, he snuck into the theater to hide before transforming one last time into vehicle form at which point he basically passed out, lost consciousness, or whatever it is robots call it when they involuntarily shut down (stasis). His aggressive reaction upon waking is simply down to his instinctive warrior reflexes immediately kicking in. All humans are a potential threat to him now, so he reacted accordingly in an instant.
Answer: Optimus was being dramatic when he said it contained their memories. Transformers don't carry their memories in their spark any more than humans carry theirs in their soul.
MasterOfAll