Revealing mistake: Towards the end when Harmony calls Perry's phone as she's lying on the ground, Harry grabs the phone and looks at the caller ID to see her name. Unfortunately that's not the display showing who's calling. Anyone who has a Nokia phone will recognise that that's showing the contact list with just two entries - Harmony and a random number. The fact that it says "contacts" at the top of the screen is a bit of a giveaway.
Revealing mistake: In the party scene, when Harmony opens the Johnny Gossamer book, it can be seen at the top of the pages that the book she is reading is actually Maureen Child's "Man Beneath the Uniform". (00:12:05)
Revealing mistake: After Harry and Perry are shot during the climactic shootout, the supposedly unconscious Perry can be seen unclenching his hand so Harry can get his gun. (01:29:45)