Tough Luck - S2-E31
Trivia: One of the applicants in Finn's audition is an obvious pun on martial arts legend Bruce Lee. As a matter of fact, the real-life Jackie Chan used to be Lee's stunt double in Fists of Fury and Enter The Dragon.
The Curse of El Chupacabra - S2-E8
Trivia: For those who are wondering what a black panther is doing in a Mexican temple - this is actually a black jaguar. Its fur is rendered black by what is called melanism, an increased amount of black pigments in its fur. These black jaguars are rare, but they do exist.
Through the Rabbit Hole - S2-E1
Trivia: The boy's comment, "Everybody is kung fu fighting" at the ruined school dance, refers to Carl Douglas' song of the same name from 1974, two years before this episode takes place, following the fledging martial arts craze in America. This song has recently (in a slight variation) resurfaced in Kung Fu Panda.