At around 12:40 Goober has the car's engine running on an engine stand in the middle of the courthouse floor. Just the cooling fan, and the generator are spinning, and they are spinning the wrong direction as well. The fan belt only goes around the fan pulley, and the generator pulley, but not the crankshaft pulley which is how these accessories are normally driven. The fan spins one speed even when Goober revs the engine.
It's pretty apparent that the car would fit through the double doors of the courthouse if they were removed or maybe even just opened fully, making the disassembling the car unnecessary.