At around 12:40, Goober has the car's engine running on an engine stand in the middle of the courthouse floor. Only the fan and the generator are turning and they are turning in the wrong direction, as well. The fan belt is shown going around the fan pulley and the generator pulley, but not the crankshaft pulley, which drives these accessories. In addition, the fan turns at one speed, even when Goober revs the engine.
It's apparent that the car would fit through the double doors of the courthouse if they were removed or maybe even just fully opened, making disassembly of the car unnecessary.