In one scene, Fred's office desk has a red button on the side to operate the trap door, but in the next scene it's gone.
The canopy to Fred's car is missing.
Fred's car horn is a bird, but previously Wilma pressed the steering wheel to make the horn beep.
As Fred walks out of the accountant's office, the chart on the wall reads "Business - This Year - A.D."
The Quarry Gatekeeper said Fred will be docked for clocking out 45 seconds early, but the quitting time whistle had already blown.