Come on, no way. Anybody in his position would have done something similar. A senior moment is getting confused at something that wouldn't otherwise confuse you. getting handed the wrong envelope which is something that has *never* happened before would probably be one of the most confusing things ever, especially with an entire theatre of people staring you down for the biggest award of the night. Maybe Beatty could have handled the situation better, but it's the dumbass PricewaterhouseCoopers people who gave him the wrong envelope's fault not his.
That's really cool!