King's Row features multiple different tracks playing in sync with each other over the base instrumental track. The overlays that I know exist are Betty Boop, Hagar (the "after all" track), Dagwood, and Blondie singing, a trumpet at the Beetle Bailey entrance of Toon Extra, and dogs barking at the fire hydrant. A source track titled "Comic Strip Lane" was released in the IOA Background Music Soundtrack Sampler album, with most of these overlays present sans Blondie & Dagwood. The full loop is ~10 minutes long.