HBP movie related question (SPOILERS)

[Jen Reese]

> > Carol, who would love to attend the HBP film with someone who
> > hasn't read the books to see whether that person can follow the plot
 
> Potioncat:
<snipping>
> Watching the movies without reading the books does give you a 
> different experience. When I finished DH, he wanted to know what
> happened---(mainly, who dies?) But his recall of past events and 
> characters from the movies didn't match what I was explaining in DH--
> it was quite interesting.

Jen: I can believe that with all the condensing and reshaping found in the movies.  As for the big events, I thought the movie ending of HBP made it obvious Snape was up to something when he killed DD, that there was ambiguity. Then my bro-in-law (movie viewer only) said something like, "So Snape was bad all along; he was just fooling Dumbledore."  I'm guessing Snape's use of an AK was the reason why he interpreted the scene that way.  IIRC the Unforgiveables aren't presented as ambiguous in the GOF movie.