Herman comes home during a thunderstorm with his lunch box filled with water, yet his clothing is dry.
To record himself singing, Herman presses a single white button on the tape recorder. In order to record, though, one would have to press both a play button and a record button (usually red) at the same time.
None of the stomping noises Herman makes while singing are heard back on the tape when it is played back later on.
Perhaps unsurprisingly, Herman's guitar chords do not match the music. He even uses different hand positions for what should be the same chord.