Continuity mistake: On the coach trip into Brighton, when Mr. Lewis is following in his car, the shadow is on the lefthand side of the car. However, when he is shown behind the bus, the sun has changed sides, giving the shadow on the other side. In the same sequence, he is seen travelling on a dual-carriageway. But when he is shown waving at Myrtle at the rear of the coach, he is shown travelling along a three-laned road.
Factual error: About ten minutes into the film, in the scene where there is a staff meeting deciding whether they should strike, the junior assistant talks about how much tea breaks cost the company each week. He says something along the lines of 'each member of staff has 18 toilet visits a day due to drinking tea. At four minutes a time this contributes to 72 minutes each day lost. This means we lose 15 hours a week due to visits to the toilet'. Even if the staff worked seven days a week, this would only amount to 8.4 hours lost.
Trivia: This was the first Carry On film to be a box-office failure and only broke even in 1978 after distribution rights and television deals.
Chloe Moore: Oh, hello Fred, Sid just give me a lift home.
Fred Moore: I hope that's all he gave you.