In real life, the website that Dr. Bedlam mentions (professorbedlam.com) linked directly to the official Fox movies website. The site has since lapsed.
In Matt's apartment, when Professor Bedlam comes to visit him, the Professor sits down on the couch and the reflection in the window shows someone walking in the reflection.
When G-girl breaks into Matt's apartment towards the end, after his car is stolen, she is wearing a diagonally striped sweatshirt and her hair is crimped. But the hood is either on or off depending on the shot. It is up when the camera is behind her, but down when the shot is over his shoulder.