The Case of the Missing Doughnut - S1-E2
Visible crew/equipment: When the invisible Doughnut enters the bakers shop you can see the arm of a crew member moving behind the counter as the shop door opens.
Here Come the Double Deckers (1970)
1 visible crew/equipment mistake in The Case of the Missing Doughnut - chronological order
Starring: Peter Firth, Brinsley Forde, Gillian Bailey, Michael Audreson
Audio problem: Billie says her line "he needs a new image" without moving her lips.