This movie asks you to believe that well into the rock-and-roll era, a saccharine ukelele song about Adam and Eve would be popular.
Popular as in one sick child likes it?
There were novelties and oddities charting at all times when otherwise people in theory 'should' have laughed them off. In the same year this movie came out, 'The Three Bells', a fairly religious song/story of a man's life, charted rather well.
This movie also asks us to believe annoying old drunk guys are really popular with teenagers. Maybe he buys them booze?