This Is Spinal Tap

The actors are all competent musicians and they're actually playing on the soundtrack.

While David and Nigel normally play guitar, they both play bass during Big Bottom because that's what the song requires. It's a musical joke.

The credits state that the band Spinal Tap is fictional, and add "And there's no Easter Bunny, either!"

The movie was released in 1994 on CD-ROM by the Voyager Company, a movie distribution company specialized in converting and releasing movies on CD-ROM format. The CD-ROM edition includes the movie as well as extra features. For instance, it has two audio commentaries, one of them from the three main cast members who are not in character. This audio commentary has never been released on any other medium. The CD also includes some fun basic options such as turning the volume to 11 or typing in popular lines and phrases from the movie, which the CD then automatically locates in the movie and plays the scene with the line. The bonus material also includes music videos, ten deleted scenes, the original Spinal Tap short that was made to sell the idea of the movie to potential producers, and some notes from the crew. Another rarity is a fake trailer presented by Rob Reiner himself for "Cheese Rolling," a mockumentary about Denmark's fictional traditional cheese festival, where small villages compete in cheese throwing and similar sports activities involving cheese that can get very intense.

Edited into The Greatest: 100 Most Metal Moments (2004)