Trivia: Because of changes to the script Joss Whedon was forced to make by the studio, he doesn't consider the film canon as established by the TV series. The studio made Whedon trim out many of the film's darker moments, in addition to a quite a few of the jokes he had written. And they also forced him to completely rewrite the climax, which originally ended with Buffy burning down the school's gym to kill the remaining vampires.
Trivia: Joss Whedon's original script, which was drastically altered by the studio, director and cast, was eventually adapted into a comic-book called "The Origin" in 1999. Whedon has said that while he has some small issues with the comic, he thinks it can be viewed as being canonical with the series, unlike the movie.
Trivia: Contrary to popular belief, Seth Green is actually not the only person to appear in both the "Buffy the Vampire Slayer" film and series. Actor Chi Muoi Lo also appears in both - playing a background vampire in the movie, and having a small uncredited part in the season 7 episode "Storyteller." While both roles are small (pretty much blink-and-you'll-miss-it), he technically did appear in both.
Trivia: The movie was partially the result of a country-music and pop-culture legend. Sandollar Productions, a studio that helped finance the film, was co-founded by Dolly Parton of all people. Sandollar also went on to be involved with the TV series and its spin-off "Angel." (Though Parton herself was not credited).