Transformers (2007)

Continuity mistake: When Sam and Mikaela handcuff all the agents, Sam is wearing a black short-sleeved tee shirt atop a blue long-sleeved tee, before putting on the hoodie. We see the dark tee sticking out when he and Mikaela climb onto Prime. Then moments later, Sam is wearing ONLY a long white short-sleeved (we see it has short sleeves when Bumblebee gives him the All Spark later, through a tear in the hoodie sleeve) tee shirt under his hoodie, when he falls from Prime, when he witnesses Bumblebee's capture and thereafter. (Earlier, after he knocks Mikaela off the moped, from that point on there is a very large hole at the back of his blue and black tees, where we see his skin under the jagged material edges, with no white material seen anywhere. We also see no sign of a long white undershirt at any time when Sam's dark tees go up, during his many action shots.)

Super Grover ★

Sam Witwicky: Fifty years from now, when you're looking back at your life, don't you want to be able to say you had the guts to get in the car?

Trivia: When Bumblebee first appears it parks itself in the used car lot beside a yellow Beetle. The yellow Beetle was Bumblebee's original form in the Transformers cartoon series.

Question: Can someone please explain why all this happened more than 100 years after Megatron crash landed on Earth? Why didn't the Transformers come sooner?