The creature's blood was made by a simple blue glow stick and adding water. And lighting the room also helped make the blood glow better on camera.
Bob Carter, the voice of the Radio Host also plays the tall alien creature towards the end of the movie. He is 6'5" in height.
After the creature's face was molded, instead of using foam latex or silicone to make the prosthetic appliance, a gelatin mix from a grocery was used instead to fit the budget. The desired effect worked out so well that it made the tentacles move independently from each other.
A business card from Dr. Michael Bilsom; Marty's psychiatrist from a previous movie titled, Not Human, is on the refrigerator when Andrea goes for milk. A foreshadowing of what's to come years later.
The first litter from each of the characters forms the words HUMAN, with Andrea being the exception; her name uses the first two letters: Henry, Ulysses, Marty and ANdrea.