From What Goes On, anomalies on Day Tripper:
Day Tripper
0:05-0:06
Click, centre.
1:20
Right channel only, someone shouts "Hey!" right before the solo starts.
1:40
The note progression that starts at 1:21 in the left channel (guitar) seems to cut off very abruptly at 1:40, as if excess was edited away.
1:50, 1:56, 2:32
There are three 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" as we plunge into the dropout. The dropout at 1:50 punches the sixth note of the riff out, 1:56 punches the first note of the riff 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!
2:40
Paul's bass line gets stuck, gets stuck, gets stuck, gets back into it.