The song Micky Dolenz sings as the Monkees enter the Big Top is the theme to Circus Boy (1956), which he starred in as a child under the name "Micky Braddock."
Another reference to Micky Dolenz' Circus Boy (1956) days: In the beginning, when Micky is trying to juggle, just as the camera pans past him he says (in a W.C. Fields voice): "Reminds me of when I was a boy."
This was the highest-rated episode of The Monkees, watched by 12,080,000 viewers, pulling in a 22.0 rating/33.3 share.
The costumes that The Monkees show up in as the Mozzarella Brothers are the same costumes that rival group the Four Martians wore in Find the Monkees (1967). Alien invaders Stuart Margolin and Nita Talbot wear them in Monkees Watch Their Feet (1968).
Musical numbers featured in this episode: 1. "She" 2. "Sometime in the Morning".