Melissa Zahs received the part of Barbra, two hours before filming of her scene.
Gad Holland, Sarah Bertz Thomas, Layla Thomas, and Melissa Zahs first starring roles in a feature film.
Melissa Zahs and JJ Lahey were both the third actors to play Barbra and Johnny.
The blood in the movie is chocolate syrup and a special mix from makeup supervisor Maggie Stockman.
There was a running joke on set that Layla Thomas looked liked Selena Gomez, while she was dressed for her role as Karen Cooper.