1Bojack Horseman

In S05E12 of Bojack Horseman, Diane is eating at an Italian restaurant with a picture of the leaning tower of Pisa in the background slanted to make the tower seem straight.
2South Park

In the South Park episode "The Red Badge of Gayness," both sides in the Civil War reenactment fly Confederate flags.
3Simpsons

In Simpsons, the reason Mr. Burns says "Ahoy Ahoy" when answering the phones is because Alexander Graham Bell wanted people to answer that way. This is just a way to show how old he is.
4Smallville

In S02E02 of Smallville, Clarke Kent's mum is carrying hot trays with oven gloves and Clarke helps out using his bare hands, small detail showing his powers.
5Simpsons

In S10E18 of Simpsons - "Simpsons Bible Stories", all of the boys are shirtless but Milhouse who wears the girls uniform.
6Friends

In S05E16 of Friends, Ross says that he and Rachel did it 298 times. This means that Rachel gets pregnant with Emma on the 300th time.
7Community

In S02E03 of Community, Abed can be seen in the background of multiple scenes with a pregnant woman. Towards the end of the episode, he can be seen delivering her baby in the back of a van.
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8The Office

In The Office, when Jim signs Meredith's pelvis cast, he signs it with his real name, "John Krasinski."
9Rick and Morty

In S03E10 of Rick and Morty, the Chinese character behind Jerry’s robe means "weak."
10Arrested Development

In S04E03 of Arrested Development, the subtitles mock Tobias as he sings a nonsense song containing the word "fallacy."