Elvis is played by the brother of lead actress Gerardine Coyne.
A stuffed cat named Chatbrol was used as a stunt double.
All the special effects for Limbo were done in camera
The character of Alice is supposed to be a female version of the Dude and was also inspired by Whoopi Goldberg. Also in the original version of the script there is a cameo by a character resembling Ned Flanders