Strickland's strange behavior , never noticed before
I never noticed how odd Strickland's behavior was after taking the mag from Biff at the dance. The dance is in full effect, he's got his eyes on Biff , and any other trouble makers to make sure the dance isn't disturbed. And just after taking the book from Biff, he goes way out of his way to walk all the way over to his office, have a bit of coffee and eventually just throw the mag out. Did he plan on staying in their longer and finishing the coffee? I don't remember but I'm assuming it was old coffee on his desk, or did he just make a new batch? After a little bit he gets up and goes back outside. Was it uncharacteristic for Strickland to 'abandon his post' for that long just to go get a caffeine fix? I mean it allows for the dramatic and entertaining sequence of Marty trying to get the book from him, ultimately to discover that its not the almanac, and then conveniently see George about to knock out Biff, but was it too unrealistic?
I might have bought it if we'd seen Strickland always with a coffee mug on him in previous scenes (catching Marty late in the beginning of part one, pulling the kick me sign off of George, etc)