Corrected entry: At the end of the film Jenna asks Matt if he signed the release form for the photos they took for her redesign. He replies that he has not trusted Lucy since they were kids, implying that he didn't sign it. There is no explanation as to why the pictures are on the buses etc.
Correction: This part never made sense and has bothered me for years! Why would he sign the release if he didn't trust Tom Tom and didn't speak with Jenna first?
Correction: Jenna's boss tells Jenna that Matt signed a release.
Disney-Freak
They didn't explain why he signed it if he doesn't trust her.