The Twist went right over my head at first

It was totally lost on me as well..lol..but, as I've said in other threads I'm actually quite glad that I missed the brief-peek in the opening scene which clearly shows Lulu is in fact Shea.. missing that key piece of info allowed me to watch the entire movie without having the predetermined multiple-personality-disorder in my mind.. therefor, it wasn't until the end that I came to understand that the cliched "twist" of MPD was the reality of the entire "goings-on" throughout the movie.

It allowed me to actually enjoy a film that otherwise I likely would have balked at in knowing the whole "Shea-is-Lulu" issue.

I had to come on this board to find out what the hell this movie meant. I am way too literal with things, I like the movie way more now that I actually get it.

I honestly didn't pick up on that twist at all until reading these boards. The twist makes me like it even more, I'll have to give it a second viewing now

In the scene where they're trying to get Simon's address, that guy Duncan said "Simon said you two got a little freaky last night". If shae and lulu are one person, why would Duncan refer to Shae as "you two"?