When they are on the porch with the freezer in the evening and it starts sparking, it is sparking directly behind and above the freezer. On the next shot of the porch in the morning, there is no electric plug or, for that matter, anything in the area where the sparking occurred. The outlet it is plugged into is on the right side of where the freezer sits on the porch.
The Taylors are shown to have a back porch, however in the previous season episode "Mr. McBevee", there is no back porch, the back door leads right to the yard.
Hanging on coat hooks on the Taylors' back porch wall, next to the old freezer, is a well-used and heavily paint-soiled fedora-style hat, and an old painting shirt or smock. They are there in the late evening when Aunt Bee comes clean to Andy about the 150 pounds of beef in the freezer. Then, early the next morning, when Andy discovers Aunt Bee sitting on the porch minding the old freezer, the two items on the wall have become two perfectly clean and different items--a baseball cap and jacket.
In the scorching heat of summer, everyone but Opie is wearing long sleeves.
At breakfast, after the discussion about Opie's new shoes, Aunt Bee gets up to refill the sugar bowl. She struggles taking a gigantic bag of sugar out of the cupboard, then proceeds to pour directly from it into the sugar bowl. Sugar spills all over the table, and she says "Oh...I always do that." Aunt Bee is a very sensible woman, and also very competent in the kitchen. Instead of "always" spilling sugar out of a huge bag, using a scoop would have made better sense.