What different versions of the movie exist?
At last check, there was the original release of the film, the re-release of the film, the re-re-release of the film, the Japanese video (with subtitles), the UK mono video, two versions of the UK stereo video, the Australian video, the US video (15th anniversary), the laserdisc, the US video re-release, the special edition laserdisc, the US video re-re-release, and the US video re-re-re-release (25th Anniversary). From version to version, different changes have been made to the soundtrack, the songs “Superheroes” and “Science Fiction/Double Feature (reprise)” have been added and removed, and, on the video and laserdisc versions, documentary footage and a “Time Warp” video have been added sometimes. The SE Laserdisc and the DVD also have oodles of extras, including a version of “Once In A While”, as does the most recent US video release. All of these different versions can be quite annoying (and expensive) for completists who want every version of everything.