* DawsonCasting: Jonathan Graves, who's supposed to be in his early-mid 20's, was played by then 34-year old Peter Liapis. Creator/MichaelDesBarres, who plays his father, is only ''a year'' older than he is.
* WhatCouldHaveBeen:
** Creator/StanWinston was initially attached to do the effects.
** The film originally began planning as ''Beasties'', and was meant to be a more family-friendly film where the Ghoulies would help a little girl. Charles Band couldn't get any investors interested in the project however, which led to his acquirement of a later script titled ''Ghoulies''.
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