When Alexander first meets Mabel, her stuck car gets mud all over his clothes. He ties a rope to a taxi to pull her car. As soon as he gets into the taxi, the mud is gone from his clothes.
Near the end, when Botts is driving the tractor through town, crashing into souvenir and refreshment stands, it has perforated grill guards installed on the front. However, when the tractor gets out in the country and climbing hills, the grill guards have disappeared. Then, at the end, when the final explosion has half-buried the tractor, they are back again.
The hat of the bell boy who delivers a telegram to Alexander is on backward.