Are you sure I wasn't involved?
As you know, I'm right there with you on the Dumbledore-can't-be-dead-it's-all-an-elaborate-deception bandwagon. I wouldn't mind seeing him alive. I also wouldn't mind seeing Snape perform some great act of self-sacrifice or heroism that stuffs a huge woolen sock into the mouths of all the Snape naysayers.
Now noting random things about the movies is one of my specialties. I’m especially good at thinking that the way Snape’s left hand rests on the table in SS indicates his allegiance to the Order and that the opening of POA, when Harry can’t get his wand to work, signifies his future troubles with erectile dysfunction.
Seriously, I read far too much into the movies and the books. I agree with you about the Legilimency thing, though. If we apply the knowledge we’ve gained from subsequent books, what do the previous books/movies tell us? That we still haven’t read book 7, but when we do, Snape will be vindicated! That’s my conclusion anyhow.