Starring: Dick Van Dyke, Mary Tyler Moore, Morey Amsterdam, Larry Mathews, Rose Marie
Your Home Sweet Home is My Home Sweet Home - S4-E25
Stupidity: Right after Rob hangs up the phone after speaking with Marge, Rob throws the paper plate and a ceramic or corelle/glass coffee cup into the trash right behind him. (Usually paper, plastic or foam cups do not have a handle on the side of them that have a light reflection on the handle).
Sally and the Lab Technician - S1-E3
Continuity mistake: When Jamie Farr the "Snappy Service" guy comes in and gives everyone their coffee Buddy throws a straw into the straw cup, but it falls down on the floor then vanishes, never to be seen again.
Rob Petrie: At least I'll prove one thing tonight: Television writers marry the prettiest girls.