There are two extremely noticeable dropouts near the end of the song. This is not on any earlier mixes of the same take, so it is quite likely that it happened during the mastering stage. Other mixes show a sound at 1:50 that was likely the reason for the dropout, and John's misplaced "yeah" at 2:32, but one has to wonder if the cure wasn't worse than the illness. This is particularly true in the 2:32 case, since one can STILL hear the "yeah." The drop outs at 1:50,1:55 punch the 1st and 6th notes of the riff clean out.
2:06
1st voice: "She was a daaay tripper, Sun-day driver yeh"
2nd voice: "She was a daaay tripper, One-day driver yeh"
John is still thinking "one-way ticket yeh" and half-sings it!