When Andy turns off the tape recorder at one point, just after a conversation between Barney and Otis, he turns it back on a few seconds later, Otis and Barney are suddenly at the end of a chorus of "Sweet Adeline" even though the recorder had not been running.
Barney tells Otis to go to Mt. Pilot for a notary, Otis goes to Mt. Pilot, Otis doesn't have a car.