The dogs who attack the undisguised aliens near the end of the film were initially too scared to approach the costumed actors. The dogs were then acclimated to the presence of the suited actors - perhaps too well, for when the time came to shoot the scene of the dogs attacking the aliens, the dogs didn't attack the aliens, but jumped playfully around and on them instead. The dogs were then trained to go for the "breathing tubes" on the alien costumes. Apparently, the actors playing the aliens had to guide the dogs to attack the "breathing tubes."

Near the end of the film, the aliens' hand weapon looks remarkably like the one the Klingons used on the original Star Trek (1966), with a shorter barrel.

The scene at the beach gave movie audiences their first look at Ty Hardin's bare chest.

The house used for the exterior of Marge and Bill's home was located at 4946 Melrose Hill St. in Los Angeles. This same home was seen in the film Halloween H20 (1998).