When Joe fakes being a photographer in the jail, there is a flash bulb in the camera flash holder. But when he holds it up as if to throw the camera, there is no bulb.
When Joe and Mabel are caught by Charlie embracing in the barn, she removes her hand from Joe's shoulder. But, in the next shot, her hand is back on his shoulder.
In the trial, the defence attorney apparently calls all his witnesses, then makes a speech to the jury, before calling a final witness. An attorney has to wait until all the witnesses have testified before making a speech.