* ActorAllusion: EdAsner's character is almost always seen in [[WesternAnimation/{{Up}} a bowtie]]
** Also in the episode "Me First", Madeline Zima plays a nanny. One of Zima's well know roles was of Grace Sheffield on "The Nanny."
** In "Pregnant Paws", Claire Coffee plays an animal boarder who contracts a serious infection from a cat scratch. On ''{{Grimm}}'', she plays Adalind Schade, a witch who places a curse on Juliette via a cat scratch.
* TheCastShowoff:
** A small one, but the season 3 premiere has Hank juggling oranges for a bit.
** Reshma Shetty sings Ave Maria in an operatic Soprano in episode 313.
* TheDanza: Jill Casey, who is played by Jill Flint and Dieter, who is played by Dieter Riesle.
* FakeAmerican: The all-American Dr. Emily Peck is played by British Anastasia Griffith
** Canadian Paolo Costanzo as New Yorker Evan R. Lawson.
* OneOfUs: Evidently, ''someone'' who works on the show lurks TV Tropes: in the fourth season episode "Dawn of the Med," Hank uses the term "NinjaPirateZombieRobot" to describe one of Evan's old Halloween costumes.
** Evan is a Trekkie. When he finds out that Paige's ex-boyfriend is one, too--and has a private space company scheduled to launch ''next year''--he has a {{nerdgasm}}.