Continuity: During the performance of the song Big Bottom, just as David sings the lyric "The looser the waistband", his girlfriend Jeanine is visible standing on the side of the stage. She didn't join the band until much later in the film, so she shouldn't even be with them. This error only shows up on the widescreen version because she's on the left edge of the screen.
Incorrectly regarded as goofs: While David and Nigel normally play guitar, they are both playing bass during Big Bottom because that's what the song requires (it's a bit of a musical joke).
Incorrectly regarded as goofs: At the time the film is set, it was common for British rock stars to be mid-Atlantic "fake Americans". This could explain Nigel's pronunciation of "semi" and Derek's "zipper". Also, note that Jeanine says "airplane" and not "aeroplane". Exit was also pronounced 'egg-sit' rather than the British 'x-it'.
Continuity: When Nigel comes back to the band and argues with David, Jeanine's scarf changes position twice.
Errors in geography: When the band is paying a visit to Elvis Presley's grave, the grave is in a wood. The real grave of Elvis Presley is in a paved garden, with a fountain right behind it and facing a wall.
Continuity: During the 'Recording Studio Meltdown' sequence, David begins playing with a white Stratocaster. In the same shot he switches to a Sunburst stratocaster and then back to a white Stratocaster in seconds (Special Edition only).
Continuity: In the hotel lobby, Nigel and Mick switch places on either side of David between shots.
Continuity: During the "Stonehenge" song, Nigel's microphone, a Shure SM-57, changes back and forth between having a windscreen and not having a windscreen.
Incorrectly regarded as goofs: On Elvis's tombstone, his middle name, Aron, really is spelled as "Aaron" (just as it was on his birth certificate).
Revealing mistakes: Throughout the film, 2x4's are visible through the windows in shots of the band's interview in front of the castle revealing that it is just a facade.
Revealing mistakes: During "Rock and Roll Creation", when Derek is trapped inside the pod, a roadie is supposedly hammering on it at one point but clearly not making contact at all.
Errors in geography: In the scene where the band goes to the "RECORDING INDUSTRY CONVENTION" the subtitle is claiming the location to be Atlanta, Georgia; while the scene in the background is clearly the famous Bonaventure Hotel in Los Angeles, and an old RTD (now the MTA) bus circa 1983 is driving by.
Continuity: David Kaff's position during the "new album cover revealed" scene (acknowledged by the crew on the Criterion Collection DVD commentary.)
Continuity: During the record company convention scene, herpes sores can be seen on the band member's lips which aren't there in most other scenes. This is because of a deleted subplot involving the band members having sex with members of another band touring with them, and they get the disease from one of the members of the other group (acknowledged by crew on Criterion Collection DVD commentary.)
Continuity: During the scene in the dressing room prior to the festival gig, David asks Viv to play a keyboard part, saying "You recall the line... it's in fifths". It is unclear which of the songs he's referring to out of "Heavy Duty" and "Hell Hole", but in both cases the guitars play unison lines rather than harmony lines in fifths.
Incorrectly regarded as goofs: Before the Jazz Odyssey scene, David and Viv are discussing the amended (and much shortened) set list. David, when running down the list says "Heavy, Hole..." rather than saying "Heavy Hole" as has been stated here before. This can be seen as a mix up between two other Tap songs, "Heavy Duty" and "Hell Hole", but in reality David is referring to the two songs separately, in a sort of shorthand (using only a portion of each title) as he runs down the list of songs they might be able to play.