The part in Grandma's Boy made me laugh so hard! I thought it was funny. I was in the room with several meat-eaters, who all knew I was vegan (and are super cool about it.) We all laughed for a long time over that scene and then I was able to jokingly play up the 'odd' vegan thing, when they know that I am not that weird. =P
I saw The Year of the Dog. I enjoyed it mostly because she got ALL of the questions that I have gotten as a vegan. So I laughed for ever! I am not sure how I feel about the portrayal of vegans though. I wont give it away, so I wont say more. I think that if you are vegan you should see it because no one will get a bigger kick out of the questions that she gets than a vegan. (Because we have all had them.)
In the movie TransAmerica there is a scene with a hippie-vegan guy. He only makes a short comment, but really works off the whole, 'All vegans are hippies and marginally off' stereotype. The rest of the movie was fantastic though and I would HIGHLY recommend it!
In the teen-flick John Tucker Must Die one of the girls that he dates is a vegan. I don't think that anyone associated with the movie had ever actually been around a vegan or even heard the stereotypes of a vegan because she would make a few anti-meat comments and a few peace and love comments, but I did not believe for a second that she was a vegan. I even think she had a leather bag in one scene. (Granted it could have been fake.) If it had not been for the few comments that she made about the subject, I would have been glad that they portrayed her as a normal girl...like most vegan females are.