Other mistake: When Brick first goes to see Betty White in the library, she gives him until Walt Whitman's birthday (May 31st) to return the books. When he returns and realises he is still short 1 book, she gives him until Sir Arthur Conan Doyle's birthday which is May 22nd - before Whitman's birthday.
The Middle (2009)
1 other mistake in Average Rules - chronological order
Starring: Neil Flynn, Patricia Heaton, Charlie McDermott, Eden Sher
Genres: Comedy
Continuity mistake: Sue says that she "matured" aka got her period, on Sept 21, but in the episode "Forced Family Fun", when they go camping and she gets it, they go before school starts, which is well before the end of September.
Operation Infiltration - S6-E18
Trivia: At Axl's party, he shakes the hand of Barry Goldberg from The Goldbergs, another ABC TV show.