'Onomatopoeia' means “words that sound like the sounds they represent.”
The speech Pigeon Man makes at the end of the episode with him and Arnold on top the Brownstone is taken from Tom Joard’s speech.
Pigeon Man flying away using a huge flock pigeons is almost similar to when James Trotter used a huge flock of seagulls.
Helga says "What did he say? Koo Koo ka choo?" a reference to The Beatles’ song “‘I am the Walrus’” in which many people thought John Lennon said "Koo Koo ka choo," when in actuality he sang "Goo Goo Gjoob."
When reversing the “spell” that made Helga disappear, Arnold says “Wolf, Abzug, Steinem, Faludi, Helga come back and shake your booty!” the four words being the last names of feminists Naomi Wolf, Bella Abzug, Gloria Steinem and Susan Faludi.
Sid feeling he should act as Arnold’s slave as a way to thank him after the latter rescued the former from a falling board, thus driving Arnold crazy is like Clumsy Smurf doing Handy’s bidding thus driving him crazy after the latter saved the former from Gargamel.
When Arnold and Gerald are in House of Costumes, Gerald comments about being a "free man in Paris, unfettered and alive," stating he heard it on one of his parent’ old albums, referring to Joni Mitchell’s 1974 Court and Spark album and the “Free Man in Paris” written by her.
Arnold’s computer is made by Purdy Electronics, Joseph Purdy being the writer of this episode.
Episode plot is very similar to when Blair Warner cheats on a poetry assignment by copying a poem by Emily Dickinson, and it ends up finishing in third place in a New York statewide poetry competition.
The sign in Phoebe’s room reads “CARPE UNUM,” which means “Seize One” in Latin.
Mud BowlGerald Moves Out
Gerald is seen kicking a parody CocaCola can before he sees his dad and decides to come home.
The High LifeBest FriendsArnold's Halloween
The “alien” costume and makeup worn by Helga, Harold, Curly, Phoebe, Rhonda, Eugene and Sid are vaguely similar to the Talosians.
The story is almost similar to the black and white segregation as the "cool kids" discriminated against the "geeks," the "geeks" having to sit at the back of the bus, sit at the geek tables, and get all the bad equipment, just like the blacks did. Not to mention Rhonda refusing to move to the back of the bus because she had glasses like Rosa Parks.
Becoming fed up with the treatment toward the geeks Rhonda yells “If you prick us, do we not bleed? If you tickle us, do we not laugh?,” a verbatim line in the first scene of act three from William Shakespeare’s The Merchant of Venice:
Shylock: If you prick us, do we not bleed? If you tickle us, do we not laugh? If you poison us, do we not die? And if you wrong us, shall we not revenge?
Helga's BoyfriendCrush on Teacher
As Gerald walks away after questioning and teasing Arnold for reading poetry, to which he replies that he likes them:
After Eugene tells some little kid who looks up to him that it has to be way past his bedtime:
Kid: I have to be in bed by 8:30 right after my favorite show Yo Ernest.
What's Opera, Arnold?
Besides episode title 'What’s Opera, Arnold?', in Helga’s dream sequence* where she parodies Elmer Fudd, she reveals her weapon to be a "golden magic slingshot" to which Gerald mentions that he thought the weapons were supposed to be a "spear and magic helmet" all alludes to What’s Opera, Doc? short.
When first introduced in Arnold’s dream, Gerald’s singing “Figaro.”
According to Gerald, Arnold has twenty three volumes of ‘The Purdy Boys’ novels.
Gerald’s operation took place at Drymon Medic Clinic, one of the show’s directors is Derek Drymon.
Arnold's RoomHelga vs. Big PattyStinky Goes Hollywood
The company that makes the publicity for “Yahoo! Soda” and where Stinky filmed all his commercials is Snee-Oosh Studios, named after the company that created this show, even having the same logo and symbol.
Stinky starring in commercials and rising to fame is similar to the late American actor, voice artist and comedian Jim Varney, best known for his role as Earnest P. Worrell.
When Eugene says “Well, some kids would do that Wolfgang. Some kids would just give up and start falling apart, piece by piece. But other kids come home from school and wash up, and go racing in the streets” refers to the “Racing in the Street” song by Bruce Springsteen.
Stars and Stripes Forever plays through the first part of the end credits.
When telling what work Helga had to do, “Big” Bob Pataki there was a three day weekend sale soming up, referring to Black Friday.
Helga's ShowThe Flood
After realizing that Mr. Simmons has been gone for some time after going to get the attention of the helicopter, the kids hear him singing The Battle Hymn of the Republic where they find him dangling helplessly from the latter two-three stories up.
Hillwood baseball team’s best player is named Mickey Kaline, a mixture of former Yankee great Mickey Mantle and former Tiger great Al Kaline, both of whom are associated with The Fifties. Given the Suburbia setting, that wouldn't be unlikely.
'Bio Square' could mean . . .
. . . a variation of “biosphere,” an experiment where a number of people planned to live about a year in an entirely self-contained collection of building where even the air and water were recycled from inside . . .
While quizzing Helga, Phoebe asks "What type of cheese is Holland famous for?" to which Helga guesses "Glockenspiel?" Though 'Glockenspiel' isn't even a type of cheese; it is a keyboard instrument with a set of metal bars, also known as orchestra bells. For the real answer, it’s Dutch cheese.
One of the signs in Mrs. Vitello's shop reads "With ferns like these, who needs anemones?" a pun off the “With friends like these, who needs enemies?” saying that means when someone one thought as a friend treats oneself in an unpleasant way.
In order to rescue Abner from being eaten by the opposing team, Harold, Arnold, Helga, Gerald, Phoebe, Sid, Stinky, Rhonda and Brainy all hide in a large wooden pig as Phil brings the “gift of truce” inside their fort, even one of the members recognizes the trick and tries to warn the leader, Rex Smythe-Higgins I, but he refuses to listen.
The events taken place in this episode are based on real life events taking place on San Juan Island in Washing State also called “The Pig War” in which the only casualty was indeed a pig, the shooting of which started the whole thing.
Once more, Elk Island is likely based on Skagit Island◊ and the fact it’s supposedly home of a massive treasure trove, in a cave, that some believe is haunted much like Money Pit on Oak Island in Nova Scotia.
On the poster has an undead corpse popping out of a grave, scaring a woman, a refence to any horror movie involving supernatural.
During their fight:
Suzie: Oh sure it’s a good day for you! Tomorrow’s a grand day for you because tomorrow is the day you get a job! Tomorrow is the day you pay the bills, tomorrow is the day you grow up and start acting responsible. But tomorrow never comes for you does it Oskar because it’s so conveniently a day away.
While stuck in traffic on his way to the hospital with sick Baby Oskar in a taxi, not only does Oskar complain about the Pope coming today but there’s a banner saying “SAY HI TO THE POPE,” who at the time of this episode, would been Pope John Paul II.
According to Phil, this episode takes during an 'Indian Summer,' a warm period during the fall months.
The movie both a young Coach Wittenberg saw at a drive-in movie theatre and the boys (Arnold, Gerald, Stinky, Sid, Harold and Eugene) re-enact has the line “Wayne! Wayne! Come back Wayne!” though here, 'Wayne' is the horse’s name instead of the cowboy.
The paper towel holder in the bathroom has “HB” carved into it, though it may refer to Harold Berman.
Both Phil and Martin Johanssen, Gerard’s dad, were both Privates in the U. S. Army, but are not promoted until the end of World War II and Vietnam War, respectively.
During the WWII flashback, Phil is seen holding an autographed photo of Austro-American starlet Hedy Lamarr while he’s peeling potatoes.
Phil delivers 'Cham' to Northern France is a parody of “Spam,” the difference between Cham and Spam being that Spam was made of ham while the Cham was combination of chicken and ham used for military for experimental purposes in 1944.
The armband of the Nazi soldiers is a sad face. This replaces the real Nazi armband of a swastika that had been used by Nazi Germany from 1933 until 1945, or Adolf Hitler's death, as it may have caused some controversy, most especially in Germany as well as in several other countries that implemented anti-Nazi laws such as Austria and Poland if they decided to use the real symbol. It is also important to note the swastika is not of German origin as the swastika has many Asian variants.
Dr. Bliss:Monday. Helga:Night Football. (fall out of chair) . . . enough word association. Dr. Bliss: Good idea.
During Helga’s flashback to when she was four or five, a fifteen year old Olga is playing on the piano with her parents behind her:
Bob: . . . Come on, play us another one Olga. Olga: I know, how about the Minute Waltz by Monsieur Frédéric Chopin? Miriam: Oh! I love that one. Bob: Yeah, you should hear her play Beethoven Miriam.
Before revealing her feelings for Arnold to Dr. Bliss, Helga questions even if under torture her secret will be kept, said torture being “stuck your head in a cage with a starved rabid rat,” the same suffering Winston Smith was subjected to.
Dino Checks Out
Some of Dino’s ’60s records spoofs other musicians including The Doors depute album The Doors and The Beatles’ Sgt. Pepper’s Lonely Hearts Club Band album.
The cover of Dino’s ‘Trippin’ With Dino’ album is based off Robert Crumb’s 1968 Keep on Truckin’ comic.
The song ‘I Will Prevail’ Principal Warts sings is a parody of Gloria Gaynor’s “I Will Survive” song.
Episode’s plot is very similar to The Simpsons episode “Sweet Seymour Skinner's Baaddaasss song” . . .
. . . goody-two-shoes Ned Flanders replaces Principal Skinner like Mr. Simmons replaces Principal Wartz, . . .
. . . with both original principals gone, the kids cause chaos in the schools, . . .
. . . Arnold and Simmons try to get Wartz back like how Bart tires to get Skinner back, . . .
. . . both Flanders and Simmons say "I intend to put the ‘pal’ back in ‘principal!’" . . .
. . . and both Principal Skinner and Principal Wartz cry when walking by the school.
New Bully on the Block
The fourth graders face two bullies sharing a name of a composer who fight over Gerald Field, the fifth grade school bully Wolfgang and new bully Ludwig who returns and wants the vacant lot for himself.
Names of Phoebe’s parents are Reba and Kyo Heyerdahl.
Arnold’s father Mitch uses the phrase “aye-aye-aye!” after falling down the cliff side for the second time is likely a referent to The Gods Must Be Crazy where a character frequently would use that phrase.
From the sleeping sickness to fictional country where Arnold’s parents set off on a rescue mission and were never heard from refers to One Hundred Years of Solitude, though in the book, it was an island called Macono.
Helga shutting both south and north gates, as well as shaking the north gates by ropes to make it look like a ghost did it.
The moment Arnold notices Curly’s red striped socks when the latter was dressed as the Ghost Bride and unmasking him is like Fred, Daphne, Shaggy, Velma and Scooby finding clues before unmasking the monster of the week.
The reveal of how the gags were pulled off.
Gerald vs. Jamie OA Day in the Life of a Classroom
'A Day in the Life of a Classroom' parodies “A Day in the Life” song by The Beatles.
The movie’s poster is like Jimmy Neutron Boy Genius with both main protagonist up front and center, friends behind him and the enemy hovering above, hovering above, reaching out to them and being larger than their actual size.
Scheck sings the line “. . . You take the high road and I’ll take the low road . . .” from The Bonnie Banks o' Loch Lomond as he drives his car down a street parallel to the one the bus Arnold, Helga and Gerald are riding is on.