Audio problem: When Julie wakes up and turns the lamp on, and it goes off, Julie says "Shit" but her mouth says "ouch." (00:08:25)
Audio problem: In this movie, when Ben gets ready to kill someone, he withdraws his hook, and we hear the sound of metal against metal. But he never scrapes or brushes metal, so this is an incorrect sound. (00:59:15)
Audio problem: After scaring Julie with his "suprise", Will decides to go and take a walk. When he says "I'm just gonna grab a few things," his mouth doesn't move. (00:38:10)
Audio problem: When Julie and Karla get their phone call from Mike In The Morning, Mike asks, "Well Karla what are you doing for this 4th of July weekend?" She says, "I'm actually school and studying really hard." When she says the last couple of words her lips don't move. (00:16:00)
Answer: I believe it was supposed to be a surprise plot twist, I don't remember there being any indication that Will was setting them up.