Other mistake: In the scene where the dead bodies are hanging, Pete has "naughty cal" carved in his chest but Carlos, the one who this was written on before doesn't have it anymore.
Other mistake: When Pete is introducing his staff and they are all dancing on stage, there is a beautiful brunette who walks up and dances almost the entire time between Juan and Sam. She is supposed to be part of his staff. Yet out of the blue when the camera pans right before Sam interrupts Pete she disappears. Literally from the entire movie to never be seen or spoken of again. There is not even a name on Sam's activity board for whoever this mystery woman is. (00:10:20 - 00:11:20)
Answer: This is a joke referring to the numerous slasher movies where the killer survives all most anything and still comes back. Like when the killer is killed of in the end of the movie but then reappears in the sequel.
Andreas[DK]