* CompletelyDifferentTitle:
** In Sweden, the movie was released under the title ''Creeping Threats''.
** In France, the movie's called ''Mutations''.
** Sometimes the film goes by the name ''Slugs'' or ''Slugs: The Movie''.
* TheDanza: ''Two'' - Mike Brady and Kim Brady are played by Michael Garfield and Kim Terry.
* DawsonCasting: The teenagers all look at least thirty.
* FakeAmerican: A lot of the characters are played by Spanish performers.
* WhatCouldHaveBeen: A sequel was announced in trades but ultimately went unproduced. That said, the original novel has a sequel itself if you want an idea of what it could have been like.
* The black slugs of the movie are [[http://en.wikipedia.org/wiki/Black_slug real]] (except the meat-eater part, of course).