In the scene where the goalie is being interviewed, he illustrates various penalties with his stick. What he refers to as "spearing" is really the penalty "butt-ending". Spearing involves jabbing with the blade of the stick, butt-handing is jabbing with the handle (knob) end of the stick.
During the opening hockey game sequence, when the drunk player on the opposing team gets checked into the boards, the players on the Chiefs bench laugh at him. There is one player on the Chiefs bench though who never appears in the movie again, and appears only for that one single shot in the film.
Reggie Dunlop leaves a tavern to go record a radio interview. When he leaves the bar, he announces that the interview will air on the radio later that day at four o'clock. During the interview, he states that he will offer a "bounty" for the first Chiefs player to assault the other team's captain on the ice in the upcoming game. After the interview, Dunlop goes home and tries to get some sleep. He listens to his own interview on the radio, including the remark about the bounty. After he turns off the radio and tries to go to bed to have a nap, the clock on his bedside table reads a quarter to four, fifteen minutes before the interview was supposed to air.
In the opening sequences introducing the players, Ned Braden can be seen wearing blue gloves as he stands by the boards. When he skates out for the introduction, he is wearing old brown gloves. When the next player is introduced, he can be seen wearing new matching blue gloves again.
In the opening hockey sequence, a Chiefs player is shown taking a slap shot, which appears to strike the sliding opposing defender in the groin, then there is a cut which shows a Chiefs playing writhing in pain from a groin injury
During the Charlestown/Hyannisport game, #7 of Hyannisport (current Anaheim Ducks coach Bruce Boudreau), is shown on the ice, celebrating a goal. In the next shot, which is a line change, #7 is shown leaving the bench to go onto the ice.
Johnnys helmet of the Cheifs changes from a Northland style, made famous by NHL great Stan Mikita, to a style of a model Cooper 600. Hockey players aren't known to swich to different essential equipment.
Just after the wives discuss the "Great Ideas of the World" set, Jean-Guy Drouin chases a player behind the net and when they come out the other side, a director in skates and a couple members of his crew can be seen on the ice in the corner of the rink.
In the 1st game of the movie there is a shot of the Chiefs bench laughing at the drunk player who accidentally urinates himself. In that shot, you see a Cheifs player that isn't shown in the rest of the movie. Many people regard this as a movie error. But in reality it's not uncommon for a person to play only one game for a minor league hockey game.
In the scene where the goalie is being interviewed, he talks about going to the penalty box. Some have mistaken that he is talking about himself, as goalies never go to the penalty box, but he is in fact simply discussing the different kinds of penalties a hockey player can go into the penalty box for committing.
A major plot point of Slap Shot is that the Chiefs are drawing almost nobody to their games, but the Hansons draw them in with their style of play when they start in games later on. However, during the game when the Hansons are allowed to play for the first time, the arena is full of screaming fans who cheer every move by the Hansons.
Through out the course of the movie, Reggie Dunlop has the team, the media, and the public duped into believing that the team is being sold to a retirement community in Florida. However, at no time does Joe McGrath, who, as G.M. of the team, has a working relationship with the owner, ever make a public comment, or stop Reggie Dunlop from perpetrating the lie. Nor does anyone know who the owner is until Dunlop blackmails him into getting the owner's name. At some point prior, the media had to know who the owner was, certainly the names of the ownership group would have been in the team's program and media guide.
During the game when Dunlop learns the team is folding, the newly acquired Hanson brothers are missing from the bench, even though they were dressed and ready in the locker room beforehand. They also cannot be on the ice, as Dunlop has not yet allowed them to play.
Ned Braden performs a striptease during the championship game fight. We see that his underwear is a "union suit" - a one piece outfit with short sleeves and short legs that buttons down the front and has a flap in the buttocks region. However, after he sits atop a goal net, somehow he has removed that article of clothing without removing the jockstrap which he was wearing over the union suit.
The goof items below may give away important plot points.
In the climactic championship game, the Chiefs are surprised by the identities of the players the other team brings out. However, in all franchise team sports leagues no players can be utilized in the playoffs unless they are present on a team's roster by a date in the regular season known as the Trading Deadline.
Despite Reggie Dunlop's efforts which lead to the Chiefs making a profit, the owner insists on dismantling the team. However, in all franchise team sports leagues this requires league consent, which would certainly not be granted to a club operating in the black.