Other mistake: Doc is walking through a field listening to the radio. In the sky, center of the screen, an airplane is seen for about 8 seconds.
The Siege of Murphytown - S3-E12
Continuity mistake: Towards the end a woman is walking towards the fence completely covered in blood and guts, we see close ups of her boots, trousers and hands all covered in dripping blood. In the next shot she is still walking but her boots and trousers are clean and the blood on her hands is very dry.
