A freeze-frame of George trying to dance (but looking more like a boxer) carries the subtitle CASSIUS CLAY WATCH OUT. Clay was later better known as Muhammad Ali.
At around 20 minutes into this episode the Monkeemobile can be seen parked in the background as the kidnappers are chasing The Monkees.
The firearm carried by George is a Thompson submachine gun with a 30 round magazine. This weapon was notoriously associated with gangsters, however it was also a favorite of law enforcement and the military.