First episode to use the "puzzle piece" graphic to fade into and out of commercial breaks, a move that characterized all of the episodes during the series' last two seasons.
In the closing fight, there are two extra CONTROL agents named "Szathmary" and "Karvelas." These are shout-outs to Irving Szathmary (composer) and Robert Karvelas ("Larabee").
When the Chief informs Max that Grubnik of KAOS is after Mimsy, 99 responds by saying that she thought he was with THRUSH. This, of course, was a sly nod to the recently canceled The Man from U.N.C.L.E. (1964).
In the bookstore scene, a sign in the background advertises a color television for $295 In 1968, the equivalent to $2,225.00 in 2020.
When Max shows Mimsi how to jump into a car, the car is parked in front of the Douglas house from My Three Sons.