Pulse (2006)

Continuity mistake: In the shot where Mattie walks towards the toilet at her school, you can see there's a pencil in her hair pointing downwards. When she's inside the toilet, the pencil's direction and her hair have both changed.

Khrinx

Tim Steinberg: It has to be a virus. I mean, his computer is probably still logged on. It's just hitting his address book.
Mattie Webber: They said, "Help me."
Stone: Yeah, but viruses always have some important-sounding shit. I mean, just the other day, I got one that said, "Urgent, Stone. Read me now." I mean, that's a natural occurrence. It happens all the time.
Isabell Fuentes: That was from me, you idiot.
Stone: Damn. That was pretty strong.

Trivia: Anytime one of the characters click on "Do you want to meet a ghost?", they all click the "to".