Supernatural Season 7 Episode 17

Dean: It's not like the guy is freakin' Norman Bates.

Referencing the 1960 movie Psycho, which initially chronicles the exploits of a secretary embezzling money from her employer. She hides at an isolated motel owned by Norman Bates, who likes to stuff animals. He claims to have a mother who lives in the house at the top of the hill, but it is eventually revealed that she is a figment of Norman's delusional mind, and he dresses up like her to kill anyone who offends "Mother."

Dean: Quit bein' Dali frickin' Yoda about this, okay?
Referencing the wise Jedi Knight of the Star Wars universe. Originally voiced by Frank Oz, Yoda was first seen in The Empire Strikes Back and went on to appear in the subsequent sequels and prequels. Although he has a tendency toward complacency, he is considered the wisest of the Jedi.

Meg: Dean, Dean, Dean, you got some 'splanin' to do.

Referencing the line commonly associated with I Love Lucy (1951-57), when Ricky (Desi Arnaz) would supposedly say this to Lucy when he's discovered that she's up to something. In fact, the specific line "Lucy, you got some 'splanin' to do." was never spoken in any episode, although Ricky did say somewhat similar lines.