I watched this movie for the first time today. It's pretty entertaining.
Enid -- At first I thought she used Ti mainly, but on second thought, she seems to use Fe, especially when she's reacting to other people mistreating her. She's against the "mainstream" and "rebels" by her choice in fashion, like with the green hair and leather jacket. I'd think an INTP would rebel with ideas more than a fashion style and react less emotionally to what others negatively think about them. Of course, I'm not suggesting that an INTP never reacts emotionally, but my first reaction toward a negative person would be stoical. I wouldn't want to show others what I am feeling, but rather, examine what they said later on. Her jokes seem based on possibilities of the moment, like when she finds her friend, Josh, to not be home, and writes a silly note about him being gay because he wasn't there to fuck her and her friend. Also, she follows her intuition toward people by following Seymour and "sensing" he's a cool guy, but not knowing how to explain that to her friend, Rebecca. She wants to portray an image of a detached, cool girl, but seems emotionally tied to the people around her. Also, she's motivated to get Seymour a girl, and forces people to do things that she wants to do, like pushing Seymour into the porn shop.
I think she may be an INFJ.
Seymour -- He's a loner who's bad with women. He has a lot of knowledge about different records, to the point of obsession. He's cynical about certain things in society, such as dating and music and families and sports. He points out errors in people's logic at the expense of good relationships with women. He hates extroverted spots like bars. Also, he says he can't relate to 99.99% of humanity.
I think he's an INTJ.