Other mistake: As Clara and Harriet are driving home from an antique store, the car runs out of gas. In the close-ups, the car has no windshield.
Dave and the Teenager - S11-E17
Other mistake: When the Harris family moves into an apartment across the hall from David and June Nelson, their 14-year-old daughter, Betty, develops a crush on David. When David and June step out onto their outdoor patio, they see Betty watching them from her own patio. This could not be possible.
Plot hole: Rick is taking care of his girlfriend's goat for a few days. He puts a bowl of milk on the floor, but The Goat will not drink. Harriet suggests, "We're probably just using the wrong method." The next scene shows Ozzie at the stove, heating milk in a baby bottle. Rick is 22 years old. Why would Ozzie and Harriet still have a baby bottle in the house?
Character mistake: Rick and his girlfriend are enjoying a picnic in the woods when a baby goat wanders by. Rick says, "He looks hungry. Seen any tin cans around?" Peggy replies, "I don't think they eat tin cans until they're older." Goats will eat the labels of cans but they do not eat the cans.
Suggested correction: It's not a character mistake if Rick genuinely believes goats eat tin cans, but it's clear his girlfriend was being sarcastic in her reply about goats not eating tin cans till they're older. Of course, Rick could be asking if there's one around so The Goat can eat the label.