The prank call name that Moe used in court to testify against Bart "Mike Rotch" was previously used by Bart as a prank call during the season 2 episode "Blood Feud".
(Smithers enters the Kwik-E-Mart to see Apu being robbed by Snake)
Smithers: Look, I'll give you each $1,000 if you pretend to let that old man out there stop this crime.
Janet Reno: (To Principal Skinner) You're wearing sneakers to a trial? Oh God, the press is going to have a field day with this.
Ralph: (Runs out of the gym) Yay, field day! I can go cuckoo and no one can stop me!
Janet Reno: That's exactly what George W. Bush said when he was inaugurated. People don't remember that.
Show Title: The Easter Bunny and the St. Patrick's Day Leprechaun leaping in the air, engaged in battle that ends when they respectively burst into decorated Easter eggs and four-leaf clovers when they punch each other.
Billboard Gag: Herman's Antiques (and guns)--[with the one-armed Herman pictured, having some of his weapons on display]
Chalkboard Gag: Jesus's last words were not "TGIF".
Lisa: Playing the violin instead of her saxophone.
Couch Gag: In a closeup shot, a hand places four Easter eggs, each decorated with the images of Marge and the kids on the couch. Afterward, Homer arrives and winds up sitting on the eggs, making a mess in the process.
The black guy with the eye patch at the end episode is based off of Marvel Comic's Nick Fury as portrayed by Samuel L. Jackson in the Marvel films. Also the program he activates is a parody of the Avengers Initiative used in those films and the elderly superheroes that appear are parodies of superheroes from both Marvel and DC Comics.
The episode title is based off DC Comics' character Batman (since one of his aliases in the comics is the Dark Knight). Additionally the Mr. Burns subplot as Fruit Bat Man is a parody of Batman as well the villains he fights which are parodies of different Batman villains.
One of the magazines Mr. Burns sees is The Mulk. This is an allusion to the comic book hero The Hulk.
The name of the episode is a parody name to the 2008 movie The Dark Knight, that starred Christian Bale and Heath Ledger.
The name of this episode is also aparodyof the 1984 sitcom Night Court, that starred Harry Anderson, Richard Moll, & John Larroquette.
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