The only major difference I saw was the dueling seen. It seemed a bit more drawn out but wasn't overly important to me. I think it fascinating that Harry can speak to snakes. Probably one of my favorite things about this book. I'm by no mean partial to snakes but because the ability is so rare it shows us just how special Harry is. 
 Snape really seems to have it out for Harry but again we find out he has no intention of going after Harry. Still there seems something sinister about him but I think to eventually make him bad would be like saying... here is a surprise evil baddie you already expected so really it doesn't seem like much of a surprise. Still there is something amiss with that man! 
 I remembered for the movie about Tom Riddle's journal but I'd completely forgotten about Ginny Weasley being controlled by Riddle/ You Know Who. 
 It always strikes me how aweful the Dursley's are to Harry. I mean it is one thing not to like someone but to treat them so poorly. Even in the Muggle world it is frowned upon! 
 Now that those two are down... onto Prisoner of Azkaban!