Not a movie, but a book, and about other mental disabilities, not bipolar, though one of the characters is probably very much so bipolar.
"like normal people" by Karen E. Bender
She wrote this book so well that I try to tell lots and lots of people to read it. I won't tell them anything more that what I'll say here. Bob, I love Bob. The story is engulfing to say the least. Give it a chance, I got through it in about 6 spurts. I've never felt emotion like that from such a common, and I do mean common, story. Everything in the character is in the words, simply and powerfully. I think psych students should be required to read this