think about this: 1. We know the Maybach Car(Sector 7 Agent Simmons' Car) & is in Chicago long before all hell breaks loose, possibly shadowing Sam 2. We know that Optimus doesn't get his Trailer until some point while the autobots are in Washington, DC & then has it for the rest of the film(Chicago & Florida) 3. We know Laserbeak attacks the Mercedes W108 during some point in the Chicago Decepticon Invasion(Superbowl Spot), possibly with Simmons being seriously hurt cause of such attack 4. We know when the autobots show up at NASA in Florida Simmons is in a wheelchair 5. It was originally stated that the Chicago Battle would be the ending of the film, but it certainly seems that the actually ending is at NASA. Unless after the Chicago Battle they go to finish the battle on the Moon. basically, it seems the real ending of DOTM is either part of the NASA scenes or really ends in outer space/the moon.