When Alex hurriedly places Natalie's file on her desk, Natalie's headshot is hidden within it. Yet, a later shot shows it hanging outside the folder, inviting Natalie's furious attention.
Not that most viewers would notice, but the schematic that Simon stuffs into his bag when he opens his locker is of a late 1920s TRF AM AC powered radio, given the dual tuned circuits and the #24 tetrode vacuum tube. It probably has at least two more tubes, one for audio and one for the AC rectifier.