After hearing the sound of approaching motorcycle's Betty and Will look out the window of her cabin and can see the three bikers coming. Once outside while they are trying to run away the bikers are just then turning on to the road where the cabin is. They could not have been seen from inside the cabin.
At the very end of this episode, Barnaby talks Betty out of selling her cabin. She then grabs the "For Sale" sign from her car, and walks over to a garbage can and throws it away. However, the sign hits the top of the garbage can, landing on its rim. She then walks away.
When Doc leaves town he makes a U-turn and then drives on the wrong side of the road.