(at around 1h 19 mins) When the Ducks are playing the yellow team, Banks is simultaneously shown as being on the bench cheering and on the ice with the puck.
During the last game, Banks is injured and leaves the game. Later, his number and jersey can be seen playing again.
In the championship game, Fulton scores a goal on a power play; however, when he shoots, five Hawks (excluding the goalie) avoid the puck. There should only be four due to the power play.
Charlie's last name is Conway, but in the end credits he is billed as Charlie Conroy.
When Bombay reads off the roster of players in the beginning, he reads, "Averman, Dave;" however, in the credits, he is billed as Lester Averman. Dave is the name of another player (Dave Karp).
The Flying V play would result in a penalty for interference in a real hockey game. Players may not body check another player who is not in possession of the puck.
Standard playoff seeding typically has the team with the best record play the team with the worst record in the first round of the playoffs. Meaning that the Ducks would have more than likely played the Hawks in the first round of the playoffs, not the championship game.
At the end of the movie, when Charlie takes the penalty shot, he has no helmet on. No youth hockey league in America would allow a player on the ice without a helmet. Also all leagues forbid half-helmet shields and require cage masks.
In the beginning of the film, when Gordon Bombay coaches D-5, there would be no way this team would be permitted to play with the lack of and/or outdated hockey equipment. Goldberg has no goalie pads, most of his skaters have no full facial protection, no shin pads, and use bike and football helmets. From at least 1980, all minor hockey programs required kids to wear full face protection.
When Gordon Bombay is arrested for DWI in Minneapolis, Minnesota, the police officer states that he will be giving him the choice between "breath, blood or urine". While that is the law and practice in the City of Hollywood and the rest of California, it is not the law in Minnesota, where police offer only breath or a choice of "blood or urine". Despite a law to the contrary, many police in Minnesota offer only blood or only urine and the courts have not disapproved.
Regarded as a plot hole while it actually it isn't, when Gordon Bombay meets his players, Goldberg tells him that he and his family will be moving to Philadelphia. He doesn't and it's never explained why. That's because it is a joke by Goldberg, because he doesn't want to be a goalie at this point in the film.
In the opening face-off of the final championship game, the referee places the puck on what is obviously a piece of highly reflective polished silver stainless steel, not white ice, that is painted to look like the markings on a hockey rink. You can tell the difference when the camera quickly switches to an overhead view of the players trying to swipe the puck, the surface is now white with no reflections and the markings are all scraped up from use and are dull in color.
Motor turning the flying puck is visible.
When Bombay pulls up and sees Fulton practicing his shot in the alley, the puck hits the van window, which shatters but does not break apart. This is consistent with safety glass (a piece of glass between two pieces of plastic) that only the windshield is made of. If a puck actually hit the side window, it would have shattered and broken out.
When Charlie scores the goal during the penalty shot, his shot is on the ice. When the camera cuts to show the puck going in, it banks high off the post to make it look more like Gordon's original missed shot.
When Bombay walks up to Hans's shop, you can see his footprints from previous takes leading up to the door.
When Hans sharpens the skates, he pushes them too hard on the grinding wheel. This would damage the blade and the grinding wheel. A light touch is required for the final sharpening of a blade, with a stone to remove burrs on the edges.
It is mentioned that one of the teams (the Panthers) is out due to measles. This issue would have long been addressed officially and thoroughly and all teams which had contact with the kids with the positive diagnosis would have been officially informed. Due to hockey being a contact sport, all parents would have been instructed by now, and possibly the entire competition would have been halted.
Throughout the film, various hockey players are shown on the ice as being both lefty and righty shots. No player is that ambidextrous, nor would they have time to switch sticks randomly while on a shift.
After Banks joins the Ducks, Tammy and Tommy Duncan head to the ice in their socks while the rest of the team have their skates on.
The chemistry teacher states that the blue balls represent hydrogen. In molecular models, white balls are used to represent hydrogen, while blue balls are used to represent nitrogen.
There are many infringements of the normal rules of ice hockey.