Trivia: During one take of a fight scene between Dr. Sam Loomis and Michael Myers, Donald Pleasance accidentally broke Don Shanks' nose.
Trivia: There is a scene where the camera slowly pans, facing the floor of a grocery store, until we see a pile of newspapers waiting to be sold with the headlines describe a heat wave invading the city. This shot reportedly took weeks to film to get the proper lighting.
Trivia: Mollie's father was played by Louis Heckerling, father of the film's director Amy Heckerling.
Trivia: There is a scene where we get a look at the neighborhood around Bob's house. We see an elderly lady sweeping her front porch, glancing suspiciously at Bob. That lady is Ruthie, and she owned the house on North Greenwich Avenue used for most of the interior shots. The porch she is sweeping is at the house across the street from hers.
Trivia: Belushi's friend and frequent co-star Dan Aykroyd hates this film. His most famous quote: "I have witches working now to jinx the thing. I hope it never gets seen, and I am going to hurl all the negative energy I can and muster all my hell energies against them. My thunderbolts are out on this one, quite truthfully." Aykroyd learned that J.T. Walsh, who had appeared in "Wired," had been cast in the film "Loose Cannons," in which he was due to star. He had him fired.
Trivia: Both Mimi Lesseos and Jean Kirkland who star in the movie are actual wrestlers, they wrestled as Magnificent Mimi and Black Venus for the AWA, WWF, and LPWA.
Trivia: In the open-matte print, right after the credits, the support beams of the movie lot walls are visible, painted in blue to simulate the sky. In the theatrical version and the current Disney+ streaming movie's original aspect ratio (bottom picture), one can still see the beams for a split second after the postman puts the letter in the mailbox (though there's no way here to identify them as lot walls).
Trivia: Sean Connery plays Dustin Hoffman's father in the movie, even though in real life he's only seven years older than Hoffman.
Trivia: The film is also widely known as "The McPherson Tape." However, this was never the official title, and is seemingly based on a misconception since the film was often circulated without the title attached in the 90s. Regardless, this incorrect title became so well-known that the film's 2020 Blu-Ray by American Genre Film Archive (AGFA) contains a double-sided cover... one with the correct title "U.F.O. Abduction," and the other with the misnomer title "The McPherson Tape."
Trivia: A great deal of the film was actually shot in Japan, and it was reportedly very difficult on the cast and crew. The cost to film in Japan was very high, and the shoot was highly restricted, causing frequent issues. The original cinematographer even left production because he became too frustrated by the experience. Filming was eventually moved to the US to combat these issues.
Trivia: Chevy Chase has a scene with actor Geoffrey Lewis in this film. The same year, Chevy played Juliette Lewis' dad in Christmas vacation...who is Geoffrey's real life daughter.