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.
Visible crew/equipment: As Scooper and Billie walk away from Mr Furber's landlady's house after returning her dog, a boom mike is reflected in the front windows of the house.
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.
Visible crew/equipment: When the gang are getting into Albert's car to go home, you can see the crew and camera lights reflected in the car door.