In the opening sketch, where the cast are dressed as ladies running around threatening slow laborers and censoring "obscene" art, they are all wearing armbands with the letters PP, meaning "Pepperpots," the Monty Python troop's affectionate label for their old lady characters.
Terry Jones and Michael Palin did their own stunt work for the underwater sequence in the Expedition to Lake Pahoe sketch. Since neither of them were experienced divers, Jones recalled that they were worried about going to the "bottom" of the set which was actually the bottom of a swimming pool.
Terry Gilliam was the only American in the group, and although he appears occasionally on-screen, his roles were generally non-speaking or with few lines. Gilliam's primary contributions, the animated sequences that "linked" the various live sketches, were one of the the key components that set Flying Circus apart from its peers, and remain among the most memorable elements of the show.