If I remember this right, then a character in "A dog's breakfast" had OCD. I have no idea how well they did it, as I did not manage to sit through the movie. I only know about it, because David Hewlett made it and was in it and therefore it was known in SGA fandom. Lots of people seemed to like it though, so ymmv.

There was also that movie that was really popular that one year about an older couple falling in love and he had OCD and was played by a very famous actor, as was she.