The song Walter sings while working out is "Highway to Nowhere" by Drake Bell.
This episode reveals Mrs. Hayfer's first name as Linda when Drake plays the DVD of her stand-up comedy gig.
In the book version, the Animal Control Guy's ID name is "Stan."
When Josh helps Drake down from Mrs. Hayfer's ceiling fan, Drake is on Josh's shoulders. They're not doing it exactly as stated in the opening theme song. The camera is in another position, and Drake says "over your shoulder" not "on your shoulders" when he sings his song I Found a Way.
When the dog catcher runs into Mrs. Hayfer's bathroom followed by Drake and Josh, all fleeing Tiberius, Drake's butt crack is briefly seen as they close the bathroom door.