Trivia: The TV edit of the film differs widely from the theatrical release - lots of footage was purposely edited out, such as when the dead Norwegian on the table blinks, and there is also a narration. Director John Carpenter has publicly stated that he finds the TV edit embarrassing and a disgrace to his movie.
Trivia: The ruins of the American and Norwegian camps are actually the same set. Carpenter saved $750,000 by only filming the one set with different lighting rather than building a second one.
Trivia: The "Blair-Thing" sequence was originally created with stop-motion animation, but a lot of the sequence was cut out since director John Carpenter was not happy with the final result. Carpenter thought it looked too fake so the full scene did not make it into the final cut of the movie.
Trivia: In the scene after Macready visits the Norwegian base, he is explaining what he saw to everyone. Childs questions what he says calling it voodoo, while Palmer says "Chariots of the Gods, man. They practically taught the Mayans everything they knew." This is in reference to Eric Von Daniken's 1968 book Chariot of the Gods, about ancient aliens being the catalyst for our modern world. (00:39:30 - 00:40:30)
Trivia: Makeup artist Rob Bottin had a nightmare making the film; he worked for 100 days straight without going home to his family, he slept on the locker room floor of the Universal lot, he had to fight to get all of his designs in the film, and as a result of the stress, he caught double pneumonia and suffered a bleeding ulcer.
Trivia: Universal's first choice to direct was Tobe Hooper, who was under contract and considered a better choice. Hooper even wrote two drafts of the screenplay as a horror-comedy, without the shape-shifting elements. After Carpenter was hired and the film made, co-producer Stuart Cohen reportedly said, "We avoided a disaster." (Sources: WhatCulture.com, Variety).