Spoilers ahead to those who haven't seen AOE yet. "In any war, there are calms between the storms. There will be days when we lose faith. Days when our allies turn against us... but the day will never come when we forsake this planet and its people." —Optimus Prime's closing narration in Dark of the Moon I rewatched the first three movies before going to see #4 and I ended up thinking of Prime's closing narration here when I was in the theater. It seemed interesting to me that 1. Prime's allies very much did turn against him in AOE and 2. Optimus was absolutely going to leave Earth to wallow in its own filth. Intentional or not, I think this really shows how big of a difference that 4(5?) year gap between DOTM and AOE made. I'm sure some other posters here can dig deeper into this and come up with some way cooler things than I could, but I just wanted to share this little observation.