Continuity mistake: During the roller skate sequence he is wearing a jumper, then before he enters the shop he is in only a shirt, then back to a jumper inside the shop.
Some Mothers do 'Ave 'Em (1973)
1 mistake in Father's Class - chronological order
Starring: Michael Crawford, Jane Hylton, Michele Dotrice, Jessica Forte
Genres: Comedy
Frank: I didn't know what a girl was until I was twelve years old.
Betty: You must of done.
Frank: How could I. I'd never seen one.
Trivia: Michael Crawford was the producers' third choice for the role of Frank Spencer. The part had been previously turned down by both Norman Wisdom and Ronnie Barker.