Revealing mistake: When viewing the dunk tank from inside the gas station, in one shot it is clear that the dunk tank does not have a seat but just a block where the seat should be, and the person being dunked does not fall, but rather pushes themselves into the water.
Buzz Driver - S5-E7
Other mistake: There is no need for there to be two lists of those who should and shouldn't drive the bus, only a list of those qualified to drive the bus.