As Taste (James Franco) and Whippit (Mila Kunis) are leaving their apartment, Taste says "Don't let yourself get attached to anything you are not willing to walk out on in thirty seconds flat." This is a reference to a quote from Heat (1995). William Fichtner (District Attorney Frank Crenshaw) was in Heat.
Cameo: Jason Jones and Samantha Bee from The Daily Show (1996) (where Steve Carell got his break) are the couple that the Fosters try to convince to give them money, by explaining all that's happened to them.
Ray Liotta and William Fichtner worked together in Grand Theft Auto: Vice City (2002). Liotta did the voice of the game's protagonist, Tommy Vercetti, while Fichtner provided the voice of his lawyer Ken Rosenberg. Fichtner's character, District Attorney Frank Crenshaw, may possibly be based on Rosenberg, as they are both lawyers. While Liotta's character, Joe Miletto, might possibly be based on Vercetti, as they are both crime bosses.
In-joke: the surnames of the two tough-looking guys that appear at the restaurant are similar with those of two of the three astronauts in the crew of Apollo 11 (Neil Armstrong, first man on the moon; Michael Collins, Command Module Pilot)
In-jokes and obscure references: When Phil (Steve Carell) and Claire (Tina Fey) return to the restaurant claiming to be friends of Will.i.am, they mistakenly call him Sam i Am. This is a reference to Los Angeles hip-hop Producer Samiyam, of whom Collins (Common) is known to be a fan.
The names of the couple played by Steve Carell and Tina Fey are Phil and Claire. This is the same name as the couple from the sitcom Modern Family (2009). In the show, the characters are played by Ty Burrel and Julie Bowen.
The trivia item below may give away important plot points.
When Taste tells Phil not to go all "Raymond Burr" on him, Taste is confusing the actor, Raymond Burr, with the U.S. politician, Aaron Burr. Raymond Burr was familiar for his television performances in Perry Mason (1957) and Ironside (1967). Aaron Burr was the third Vice President of the U.S., most famous for killing Alexander Hamilton in a duel in 1804. This reference would be lost on people unfamiliar with U.S. political history, and especially on non-U.S. audiences.