"Daydream Believer" was The Monkees' third, and final, #1 single. It was written by former The Kingston Trio member John Stewart.
By the calendar on the wall in the museum guards' office, around 15:12 and elsewhere, it's the month of February 1967 (though the year is blacked out). The calendar features ad art for Carta Blanca, a Mexican beer brand that is still in business.
Vic Tayback's third and final appearance on the series, each time as one of the villains-of-the-week, but never as the same character.
The scene where Liberace destroys his piano was inspired by conceptual artist Montañez Ortiz whose famous piano destruction concerts involved destroying a piano using an ax.
During the romp set to "Randy Scouse Git", in some clips, Peter is seen being chased by Duce and Chuche in the museum basement. Peter is wearing the clothes he wore during the earlier part of the show instead of the black outfit he wears during the break-in. This suggests that another romp was filmed that was supposed to take place earlier in the story.