Personally I wouldn't go for movies, they are too long in my opinion when you are using them for study. In learning accents I always go to YouTube and find several videos which feature someone talking in the target accent for a few minutes.
Get your students watching and imitating the accent and speaker. If the actual content is dull, it doesn't matter because the videos are short and the students know that in a few minutes they will be watching another video on a different subject.
- For Teachers