As an in-joke to the film 1776, the high school is named John Adams High. William Daniels played John Adams in the film, and plays the principal here.
Several times throughout the years they mention how Cory and Topanga first met, but it's never the same story. Their "first" meeting happened at several different ages and places.
The 'rules' posted in the John Adams High School cafeteria are "No loud talking, no reading, no shooting".
In the beginning of the show, Shawn mentions he has a sister. This 'sister' helped with the "straightening" of Cory's hair in one of the episodes. However, later on in the show, we learn that Shawn doesn't have a sister.
In Episode 3-17 The Pink Flamingo Kid, we find out that Shawn has a half brother named Eddie, who he protects Cory from when Cory tapes him with stolen goods. We never hear about Eddie again, or a brother of Shawn's till Jack enters the show in season 5 as Shawn's half brother.
In the series finale Cory talks to his little brother Joshua, played by Daniel Jacobs (IV). Earlier in the season, Daniel Jacobs played the little boy standing in the hallway when Topanga and Cory move into their apartment in "The Honeymoon is Over"
In episode 119, "Kid Gloves", we see Cory scuba diving in the school pool from his point of view, and then come up to the surface to see Mr. Feeny looking down on him. This mimicks a scene in The Graduate in which Dustin Hoffman's character comes up from scuba diving to see his father looking down on him who, like Mr. Feeny, is also played by William Daniels.
The episodes "Prom-ises, Prom-ises", "If You Can't Be With the One You Love...", and "The Truth About Honesty" are banned from airing on The Disney Channel due to their frank discussion about pre-marital sex and teen drinking.
In the episode when Topanga has a crush on Eric, she introduces her sister Nebula. After that episode we never hear from Nebula again.
Topanga's father, Jedediah Lawrence, has been played by three different actors: first Peter Tork, then Michael McKean, and finally Mark Harelik. Her mother, Rhiannon Lawrence, has been played by two different actresses: 'Annette OToole and Marcia Cross.
Cory's first name stands for Cornelius.
In the episode where Topanga runs away from home, her Aunt Prudence comes to collect her. She tells Cory that her aunt has never been in love and wouldn't even know who Romeo and Juliet are. Her aunt is played by Olivia Hussey, who played Juliet in Franco Zeffirelli's Romeo and Juliet.
Danielle Fishel was originally cast as a guest star on the pilot. The actress who was cast as 'Topanga' wasn't 'working out'. Danielle and another girl were asked to read on the spot. Danielle won the role.
During the seven seasons of Boy Meets World, Willie Garson appears as three different characters. He plays Leonard Spinelli, Mervyn, and the minister who marries Topanga and Cory.
The character 'Dana Pruitt' was a tribute to actress Dayna Price, who was an avid fan of the show and frequently visited the set in addition to her two guest appearances. Ironically, the role of 'Dana' was played by 'Larissa Oleynik', who starred on The Secret World of Alex Mack', on which the real-life Dayna was a recurring character.
The names that Corey says that he and Topanga will name their children are Chewbacca and Plankton.
In numerous episodes, the boys' bathroom changes and is used as Feeny's office, the guidance counselor's office, a classroom, and the girls' bathroom.
Blake Soper (now Blake Sennett) who played Joey "The Rat" Epstein in many BMW episodes, later went on to co-front the very successful Los Angeles band Rilo Kiley (with fellow child actor Jenny Lewis (Troop Beverly Hills among other projects), as well as his own breakaway band The Elected.
The character of Topanga was originally just a fringe character, a kind of "hippie new-age" girl intended as a foil to the main characters. But she proved so popular that the producers expanded her character to become more "normal" and, eventually, a main player in the series and the love interest of Corey Matthews.
The real ages of all the characters who end up in college together (Cory, Eric, Topanga, Shawn and Jack) differ from just a few years apart between each other except Anglea played by Trina McGee who is actually the oldest of them all. However, in the show Eric and Jack are supposedly seniors in college while Cory, Topanga, Shawn and Angela get into college at the same time stating that they're all probably the same age. Trina McGee is in fact 10 years older than Rider Strong, and seven years older than Will Friedle who plays Eric. Where else, Jack (Matthew Lawrence) and Ben Savage's Cory are actually the same age in real life.
Mr. Feeny and Dean Bolander get married on the show; William Daniels (Feeny) and Bonnie Bartlett (Bolander) are married in real life as well.
Danielle Fishel claims that producer Michael Jacobs named her character "Topanga" after Topanga Canyon in Los Angeles. Jacobs was driving past that location, when production called and asked for a name for the character. Jacobs admitted that if he drove any further when the call came, he would have named the character "Canoga."
The character of Topanga debuts, played by Danielle Fishel. She was never supposed to have that role. In that episode, there were two classmates who were giving a presentation in class. One of them was Marla Sokoloff and the other was a blonde girl named Megan Parlen. Danielle was supposed to be Megan's role, but producer Michael Jacobs was so impressed with her that he gave her the role of Topanga the night before shooting the episode. She became a regular character during Episode 8.
Topanga says that her mother's name is Chloe. However, in later episodes her mother's name is Rhiannon.