Creator Backlash: Tom Davis, who created the characters on Saturday Night Live, wrote the first version of the screenplay. He was unhappy with choices made by the producers, including setting the Remulak scenes in a gladiators' arena, rather than the suburban environment that he envisioned.
Missing Trailer Scene: The trailer revealed that Beldar first claimed to "come from France" when a man he drove in his taxinote played by Drew Carey asked where he came from, and Beldar noticed a bus with an advertisement for France on its side.
Real-Life Relative: Connie at 3 years old is played by Dan Aykroyd's then-toddler daughter. He brought her to the set one day and she loved the cone head costumes so much that she begged her father for one. The crew obliged and decided to Throw It In!.
Recycled Script: Many elements of the plot were taken from the 1983 Rankin-Bass animated special The Coneheads, which was also co-written by Tom Davis.
Role Reprise: Dan Aykroyd and Jane Curtin reprise their respective roles of Beldar and Prymaat from the Saturday Night Live sketches.
What Could Have Been: As Conan O'Brien mentioned on his podcast, he was an extra in one scene (he played one of the Remulakans) but it wasn't used in the final film.