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.
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 Dustin Lockwood and NHL stars Jonathan Toews, Zack Parise, and Sidney Crosby.
The Eden Hall Academy ice rink was actually the Columbia Arena located in Fridley, MN. In the "unofficial" JV/Varsity game, the fog was real. The Columbia would become foggy in the mornings due to the age and ventilation of the rink. It has since been torn down.
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.
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.
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.