Although edits in the show are common, there's a particularly jarring edit point around the 4'28m mark, where Eddie goes from a close up looking out to the audience to a mid-shot looking right (his left) at Syd.
The end credits are slightly crooked.
During the "Cobblers" song, Eddie appears to be continually glancing off screen, presumably at a cue card with the words.
During the studio scenes, Syd appears to have a spot below the right side of his nose that make-up hasn't been able to completely cover.
Although Eddie does a commendable job at miming during the closing number, it's clear that he's not singing "Coward of the County" live.