'Happy Death Day' trivia and fun facts

The mask test

Director Christopher Landon tested wearing the option of a baby mask for the killer in the office and scared a worker, confirming his choice.

The costume designer

The Bayford University Baby killer costume is designed by Tony Gardner, who also designed the Ghostface mask, the horror icon of the Scream franchise and which is a reworked version of the Father's Death Halloween costume.

The original mask

The original mascot and mask designed by Tony Gardner for the killer was a pig, a motif already done in the Saw movies.