A scene which was changed due to budgetary reasons had Sara scratch a campus student's cheek with her alien finger, which looked like a spike. Instead, this was changed to Sara throwing the man over her into a hedge in the final film.
Producer Frank Mancuso Jr. wanted the creatures to look slightly different from H.R. Giger's original concept. He did not contribute to the designs in this film and the creatures were redesigned by Rob Hinderstein.