Title: "Mystery meat" is a term often used to describe meat in cafeterias, usually implying a poor quality meat source.
Mr. Lancer's personality, and his yelling at Danny, Tucker, and Sam for the mess at the school is clearly based on Richard Vernon's personality, and yelling at John Bender, and the other five students from the 1985 film, The Breakfast Club.
Title: "One of a Kind" is a phrase used to describe something unique and unlike anything else in the world.
While Sampson is attacking Skulker, Danny, Sam and Tucker watch while showing expressions of exclamation at the ferocity of Sampson's attack. In one shot, they are each covering either their ears, eyes, or mouth, parodying the concept of See No Evil, Hear No Evil, Speak No Evil.
The game displayed on the PDA when Skulker is waiting for Danny to show up appears to be PONG.
The names "Sampson" and "Delilah" refer to the biblical story of Sampson.
The ring tone for Tucker's PDA is the "William Tell Overture" composed by Gioacchino Rossini.
When talking about the Genius MagazineMaddie Fenton cites the feminist slogan "Beside every great man, there's a great woman" a little bit inside out: "I think that beside every genius woman, there is a genius man."
When Tucker captures the Box Ghost into the Fenton Thermos, he says, "Goodnight, everybody," a reference to the 1993 cartoon Animaniacs, which featured Rob Paulsen as the one of the main characters, Yakko Warner, who would often blow a kiss at the audience and say, "Goodnight, everybody" after an innuendo.
Title: The show's title may be a reference to the old phrase "splitting image", which is where one looks remarkably like another. Considering Poindexter and Danny are each stuck in the other's body for a majority of this episode, it can be inferred that each one is a splitting image of the other.
The "I can't believe it's not a frog cadaver" is a spoof of the product "I Can't Believe It's Not Butter."
The "Save the Frogs" campaign is a parody of "Save the Whales."
When Danny first encountered the Box Ghost in this episode and was flung to the auditorium, he was attacked with "costumes and props from the Broadway classic, My Fair Lady."
In the flying car scene, Danny says to the driver, "Slow down, Jeff Gordon!" This is a reference to 4-time NASCAR champion Jeff Gordon. Gordon has also appeared in Nickelodeon Magazine several times.
In the movie theater scene, Tucker and Danny are behind an arcade game. The game is actually "Crash Nebula" from another Butch Hartman-created cartoon, The Fairly OddParents.
During the football game, one of the announcers exclaims, "Holy Mark McGwire!" referring to the famous baseball player.
Danny's false pleading of "Don't throw me into the Ghost Zone!" is a based on a scene from the Walt Disney movie Song of the South, in which Br'er Rabbit escapes the clutches of Br'er Fox by begging him not to toss him into a briar patch.
Title: "My Brother's Keeper" is a reference to a quote in the Biblical story of the brothers Cain and Abel. When God asks Cain where his brother Abel is, Cain replies "Am I my brother's keeper?"
While chasing the ghost hornet, Danny says "Somebody call for an exterminator?" This could be a reference to a Starcraft unit, called the Ghost, who says this line.
The scene where Bertrand tries to fight Danny in ninja form, and is taken down in one shot may also be a reference to Indiana Jones and the Raiders of the Lost Ark, in which a low-ranking bad guy attempts to show off his prowess with a weapon, only to be taken down by a single shot from the hero.
Title: The "Gray" in "Shades of Gray" refers to Valerie's family name. As a whole, the title could refer to the phrase "shades of gray," which means a "medium" state. This usually means in between good (white) and bad (black).
Danny's brief nickname for the ghost dog "Cujo" is based on Stephen King's horror novel and movie of the same name.
Danny references the song, "Who Let the Dogs Out?" by Baha Men, when he jokes, "Who let the dogs in?" after Cujo breaks into the Casper High cafeteria.
Sam calling Valerie "Valerie the Ghost Slayer" may be a reference to the movie and TV show Buffy the Vampire Slayer.
The Bat logo on the title card is similar to the Batman logo.
The name of the street on the sign on the stop-sign-turned-light-post (Elm Street) is a reference to the 1984 movie Nightmare on Elm Street.
When Danny and the Fright Knight are fighting on the roof, Danny says, "Way to whiff, Mr. October." "Mr. October" was the nickname given to baseball player Reggie Jackson, who was known for his clutch hitting in the postseason.
Title: A "control freak" is someone who is extremely bossy, meddling, or controlling.
When Danny traps Mr. Lancer in the janitor's closet, Mr. Lancer mentions a cask of amontillado, a reference to the book The Cask of Amontillado by Edgar Allan Poe. Mr. Lancer is in a very similar situation to Fortunato, one of the characters in the story.
When Tucker and Sam enter the Circus Gothica train, one of the stolen paintings is the famed Mona Lisa.
Jack calls Jeremy "Thurston" after Jeremy apologizes to him and Maddie. The name "Thurston" is a reference to the Gilligan's Island character, Thurston Howell III, a millionaire.
Freakshow acts very similar to the Joker from the Batman comics due to his similar laugh and appearance.