The name "Eden Hall Academy" is an amalgamation of the Twin Cities suburb of Eden Prairie and private schools Cretin-Derham Hall and Saint Thomas Academy. In addition, Eden Hall's commitment to excellence in varsity hockey may or may not be modeled after Shattuck-St. Mary's, a boarding school in Faribault, MN, that has taught the likes of NHL stars Jonathan Toews, Zack Parise, and Sidney Crosby.
In D2: The Mighty Ducks, Hans' brother Jan mentions that Charlie's mother Casey got remarried between the first two films. There is absolutely no mention of her still being married in this film. If you pay close enough attention, you'll easily notice that she is not wearing a wedding ring at any point of the movie.
In later interviews, Joshua Jackson admitted to having little to no interest in doing another Mighty Ducks movie and that he was ready to move on to more adult roles. He said he used a lot of that attitude in his portrayal of Charlie Conway in this film, as the script calls for Charlie to be more rebellious and moody, so he channeled his feelings at the time of doing another Mighty Ducks movie through the role.
When Coach Orion posts the positions, Russ makes a comment about being placed on 3rd line, regarding it being a major dis (insult). He isn't wrong in saying so since at this point the Ducks only have 12 players (2 of which being goalies) and Russ being one of the two remaining defense-men on the team, the other being Fulton.
The trivia items below may give away important plot points.
The three players the Ducks put on the ice during the final play of the big showdown are the ones who scored the winning goal in the final game of each film in the trilogy: Charlie Conway scored the winning goal against the Hawks in the first film, Adam Banks scored the deciding goal in the shootout against Iceland in the sequel, and Goldberg scores the winning goal in this movie.
Out of all three Mighty Ducks films, this one contains the least amount of hockey playing. The Ducks are only shown playing three times (Hans listens to them play offscreen once over the radio in the scene where he and Charlie have an argument), the first being against the Blake Bears, and twice against the Varsity Warriors including the unofficial scrimmage game.
When Charlie gets kicked off the team by Coach Orion after the "unofficial" JV/Varsity showdown, the only other player to join Charlie in leaving the team is Fulton. This is fitting since Fulton and Charlie were the first two players to agree to become Ducks in the first movie.
Despite being given top billing, Emilio Estevez only appears as Gordon Bombay at the beginning, during the middle scene with Charlie, and towards the end of the film. Altogether he has less than 20 minutes of screen time. He was busy filming another film, The War at Home, that he wasn't able to devote much time to this film, hence the much smaller role than in the past two films. He agreed to a smaller role in the film for free in exchange for Disney helping fund The War at Home.
Although team member #21 Dean Portman (played by Aaron Lohr) returns in this film, he doesn't actually appear and rejoin the Ducks until the last ten minutes and even more so, he doesn't get to play for too long before being sent to the penalty box. So his role in the film is even smaller and shorter than Gordon Bombay's.
This is the only film in the Mighty Ducks trilogy where they win against their main opponents during a regulation period of the hockey game. In the first movie, they win against the Hawks by a penalty shot at the end of regulation, while in the second film, they win against Iceland by a best of five shootout.
When the Ducks attend their first day of school, they discuss the new coach. The rumors say he used to play with the Minessota North Stars but left after punching his coach. Later in the movie, Hans confirms the rumour that Orion was with the North Stars and left in his prime. Later on, Gordon Bombay explains why he left. Because his daughter had an accident and he didn't want to move her away from her friends, family and doctors while she was recovering. So part of the rumour is true. The part where he punched his coach is never confirmed or denied.
This is the only film in the trilogy where the Ducks do not end up recruiting any new players to help them win and play better against their opponents. In the first film, they recruited Tommy and Tammy Duncan, Fulton Reed and eventually acquired Adam Banks from their opposing rival team the Hawks. In the second film, the eight Ducks from Minnesota are joined by Dean Portman, Julie "The Cat" Gaffney, Luis Mendoza, Dwayne Robertson and Ken Wu. They also later recruit Russ Tyler to join the team. In the 3rd movie however they did get Adam Banks back to there team by wanting him to come back from being on the Varsity Squad
The first film where the Ducks are not considered to be total losers in their early efforts, at first. They appear to be totally dominating, but eventually lose in the first portrayed hockey game of the movie.