In the "New Brain Sketch," they repeat the running shoe size gag from an earlier episode, 'The All-England Summarize Proust Competition.'
When Graham Chapman and Terry Jones are walking down the street at the end of the "New Brain Sketch" they pass a couple of unexploded Scotsmen from the earlier episode, A Book at Bedtime (1973).
Eric Idle portrays "Dickie Attenborough," a clear reference to Richard Attenborough, who also sometimes went by Dickie. His brother, David Attenborough, worked at the BBC and actually gave this series the green light.
This is the only episode of the series that does not feature the opening credits. (It is, however, the third and final episode to feature Her Royal Highness the Dummy Princess Margaret.)