This episode was first to be shot in color, although The Night of the Eccentrics (1966) was aired first.
First appearance of West sliding down a wooden chute. This scene is re-used in several future episodes: 1. The Night of the Raven (1966). 2. The Night of the Poisonous Posey (1966). 3. The Night of the Feathered Fury (1967).
In the final act, when Colonel Mayo refers to Singh's castle as "a stately pleasure-dome" he is - rather appropriately - referencing the 1797 poem Kubla Khan by Samuel Taylor Coleridge; a poem which tells of a palace built above "a sunless sea."
Actor Boris Karloff (real name William Henry Pratt) had Indian ancestry. His father, Edward John Pratt, Jr. was an Anglo-Indian, from a British father and an Indian mother. Boris Karloff's mother also had some Indian ancestry.
The image of Singh's castle is a matte painting overlay onto Vasquez Rocks.