Other mistake: When the phone pole was installed with a "butt set" to talk with, they used it upside down for a long time. Someone must have brought it to the director, because they finally corrected the problem.
Other mistake: In the opening sequence Oliver stops the tractor in front of the house by pulling a lever. This lever is not a brake but is to engage a wheel to put a belt around to operate a threshing machine.
Suggested correction: The lever is to engage and disengage the clutch, when he pulls it back that disengages and the tractor would stop.
Older tractors had a hand clutch like that.