Carry On Again Doctor (1969)

Revealing mistake: Miss Fosdick searches in her filing cabinet, but there are no files visible only the file holders.

Gladstone Screwer: I'll call you "Sunday."
Matron: Well, I won't be in.

Trivia: Wilfrid Brambell has a cameo role as Mr. Pullen in this film. During Brambell's appearance, you can hear the 'Steptoe & Son' theme, the TV series in which he appeared.