Visible crew/equipment: Doughnut is standing on the platform on the bus after the gang refuse to let him in because he is late. When the gang come out to wish him a happy birthday a boom mike shadow is visible on the wall behind him.
Continuity mistake: When Sticks and Spring are on the staircase they have custard pies in their hands but when Albert falls through the banisters the pies have vanished, also the custard pie that was left on the bar has also vanished.
