The Amnesia Plot: The same thing EVERY TIME. I must have seen this one on at least 3 sitcoms; someone gets amnesia, other characters try to convince that person that they enjoy doing chores, person is stupid enough to do it, then the person gets another bump on the head and is cured. For extra wackiness, sometimes the person will pretend to still have amnesia, lure other characters into position while pretending to do chore, then whack them on the head. Hilarity ensues.
Every building in Seattle has a clear view of the Space Needle, half of the buildings in New York have a clear view of the statue of liberty, and every building in Paris (without exception) has a view of the eiffel tower. Also, every building that is in France is also in Paris (go figure.)
Guy did something stupid. Guy doesn’t want girlfriend to find out. Guy scrambles around doing stupid things so she won’t find out / it will get fixed before she finds out. Girl finds out, and then kisses Guy, regardless of what he did. i.e. “You stole a gun and murdered my best friend…for me!? That is so sweet!!”
Everybody sits on one side of the table so that you can see them all at the same time, you can walk around everybody’s couch (nobody has them, god forbid, against the wall) and the architects somehow designed all of the houses so that all the appliances, doors, and furniture goes on one side of the house, with the other side being (presumably) just a blank wall.
All men are incompetent at everything in the kitchen, and must be stupid and oafish compared to the female lead.
Without exception, there are no flawed minorities. (Scott Adams wrote briefly about this in his book, 7 Years Of Highly Defective People.) If you have a wacky, flawed character, he/she has to be caucasian male, or it won’t be politically correct. If you have a female/minority, they must be perfect in every way, so as not to offend minorities. The result is a highly unrealistic environment.