From the radio station broadcast we can work out that the comet passed the Earth on the eve of Thursday 13 December, 1984.

The photo of Reggie and Sam's father is actually the Director, Thom Eberhardt.

The Director's wife's family features in the still photo of Hector's family.

Kelli Maroney [Samantha] originally auditioned for the part of Regina.

The film's zombie make-up effects were created by David Miller Creations. Other examples of David Millers work also include prothetics for A Nightmare on Elm Street, Coneheads and Angel (TV series).

As Regina emerges from the movie theater the morning after the comet, a poster for Death Race 2000 (1975), which starred Mary Woronov [Audrey] can be seen on the door.

The production designer, John Muto, used what he describes as a 'comic book' sensibility for the film. Characters were given specific colours, with the bad guys in blues and grays and the girls in colours. Regina's colours were deeper than Sam's to reflect that Regina was more intellectual than Sam and that Sam was wackier than Regina. For example, Sam's cheerleading outfit is made in magenta and turquoise to make it really stand out.

The original working title for the film was Teenage Mutant Horror Comet Zombies.

The LP that Sam tosses over her shoulder in the DJ booth is the soundtrack to Valley Girl (1983), which would become, for a short time, one of the most sought-after albums of all time.

On the wall at the movie theater is a poster for Valley Girl, also starring Michael Bowen [Larry].

The movie poster on the door of the projector room (seen as Larry leaves) is for a 1932 movie called Red Dust.

in 1990 Kelli Maroney starred in Hard to Die and was billed as D Mason Keener - the same name as DMK from Night of the Comet [this was becasue she did the film as a favour to the director and didn't want to be credited; therefore, she used an alias].

Robert Beltran and Mary Woronov had both worked together previously in the 1982 film Eating Raoul.

Kelli Maroney and Mary Woronov were both in the 1986 film Chopping Mall.

Near the beginning of the film when Reggie flees downtown LA on her boyfriend's motorcycle, she comes to a stop beside a brown Mercedes 300D. This shot, along with most others, was shot during the middle of a normal business day. The Mercedes belonged to writer/director Thom Eberhardt.

The 2003 'zombie' film, 28 Days Later, pays homage to NOTC with a scene near the begining of the movie where the lead encounters a Mercedes abandoned in the road.

Fast Times at Ridgemont High and Night of the Comet (both staring Kelli Maroney) are two of the very few films to feature the Asteroids computer game.

Bee smoke was used to create fog in the film.

In September 2005, Ain't it Cool News ran an announcement on a sequel to Night of the Comet. Kelli Maroney was to reprise her role as Sam and co-produce Night of the Comet II with Charlie Mason for his company, Ride the Rails Entertainment. At the time, the company just needed to clear the rights. Kelli Maroney eventually tracked down the rights to MGM, however, Kelli's plans for the sequel were halted when MGM refused to sell the rights and said that they intended to hold on to them despite have no immediate plans of their own to develop them.

The young boy survivor named Brian (Chance Boyer) is the real life son of Sharon Farrell who played Doris Belmont, the girls’ step-mother.