Trivia: Although Joan Sims plays Patsy Rowlands' mother in this film, Sims was only four years older than Rowlands.
Suggested correction: There was only eight months between the two actresses.
Wikipedia has Patsy Rowland's date of birth wrong. Patsy died in 2005 and in a 2005 article by The Guardian, the article list her age as 71. This would put her birth year 1934, not 1931, which is also confirmed at the end of the article.
Trivia: During filming of the scene where the doctor is removing the splinter from Professor Crump's foot at the hospital, George Layton accidentally sliced Kenneth Williams' toe with a scalpel.
Trivia: When Ernie opens the caravan door and says, "I don't think there are any holes around here", he then falls into a water-filled hole. Jack Douglas was not informed where the hole would be, so the fall you see was real.
Trivia: During Professor Crump's lecture, we see a student eating an ice-cream. This student is Kenneth Connor's real-life son, Jeremy.
Trivia: The role of Fred Ramsden (portrayed by Windsor Davies) was originally intended for Carry On regular Sid James.
Trivia: In the butcher's shop scene at the beginning of the film, Fred rescues Ernie who has been locked in the freezer overnight. Jack Douglas was covered in frost effect plastic for the scene, but the rest of the cast/crew felt he had got away lightly, and threw him into a river.
