Trivia: A young Sally Geeson, who would later star in Carry On Abroad and Carry On Girls, can be seen amongst the children watching Mr. Courtenay at the toy exhibition.
Trivia: When Francis is trying to hail a taxi with the chimp, the taxi driver says, "I'll take you, but not your brother." This line was not in the script; it was ad-libbed by Fred Griffiths.
Trivia: The role of Montgomery Infield-Hopping (portrayed by Terence Longdon) was originally written for Leslie Phillips. However, he turned it down to avoid being typecast. The part was greatly reduced before Longdon was cast.
