Starring: Ken Berry, George Lindsey, Jack Dodson, Paul Hartman
Emmett's 50th Birthday - S1-E11
Revealing mistake: As Millie Swanson exits Emmett's Fix-It Shop and passes by the window, she casts a shadow on the painted backdrop which depicts other buildings. The mailman then walks into the shop and he, too, casts a shadow on the backdrop.
Andy and Helen Get Married - S1-E1
Other mistake: Sam Jones' son, Mike, tells Aunt Bee that the farmhouse has been in their family for 150 years. While showing Aunt Bee a photo album, he points to a photo and says, "That's my great-great-grandfather who started this farm." Pointing to a woman in the same photo, Mike says, "That's my great-grandmother. She lives in Philadelphia." It is very unlikely that the daughter of a man who had started a farm 150 years earlier would still be alive. Assuming the man started the farm when he was in his 20s, he would have had to father a child when he was in his 70s and she would now have to be in her 100s.