Original aired episode and early VHS releases had a different instrumental opening theme by
Ted Nichols (a small section of which was always played over the episode title cards throughout the series). Subsequent airings and DVD releases have substituted all opening and closings to feature
David Mook's familiar song. This more familiar lyrical theme by Mook would makes it's debut in this episode's end credits, but would not become the opening song until
Hassle in the Castle (1969). Nichols' theme on original airings was still heard over the end credits on select episodes.