Audio problem: Right after Max and Tom watch the two fake snuff films, Max mentions the record company's lack of interest. At one point his lip movements don't seem to match his words. (00:50:35)
Audio problem: When Machine's mom was telling him she'd really hope he'd go to church with her tonight, her mouth was saying something completely different.
Answer: Machine first rips off the tape then slits his throat with a knife he had hidden. If you put the movie in slow play, you will see what I mean.