Corrected entry: During 'Big Bottom', not only are all three band members playing bass guitars, but Derek is playing double necked bass. This is a parody of Jimmy Page's double necked Gibson SG (which he used on Stairway To Heaven), with one neck having six strings with the other having 12. Both of Derek's bass necks have four strings, which defies the point of a double necked guitar.
Corrected entry: When reading the reviews of Spinal Tap's various albums, Marty reads a review of an album called "The Gospel According to Spinal Tap." However when the picture of the album cover is shown, the album's actual title is revealed to be "Rock N Roll Creation."
Corrected entry: When Nigel reappears at the gig at the end where he is invited back on stage, he walks in moments before the band go onstage. The stage is already set and the road crew are unlikely to set up and check equipment that won't be used. So, why is Nigel's custom Les Paul and wireless out on stage when he walks on? The band wern't expecting him back and David had already said they wouldn't be working together again.