Accidental 911 call

In the opening scene where Casey Becker meets her grizzly fate, Drew Barrymore was handed a working telephone that was connected to a real landline.

The actress accidentally dialled 911 in between takes, and police dispatchers were left genuinely concerned when Barrymore began screaming as she acted being chased by Ghostface.

Due to her screams, the police called back to ask if she needed assistance, and it was only then that it dawned on the production team that the phone was working!