Continuity: 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.
Continuity: When Reg fakes reading the paper to stage "bumping into" Francine, his right hand moves from holding the paper under his left arm to not holding it between shots.
Audio/visual unsynchronized: During Ned's striptease during the championship game, the band members are clapping when seen in the long shots, but their music is still playing.
Continuity: When the Hansons first take the ice, the drink can on Jim Carr's (announcer) desk changes from Fanta to Coca Cola and back again several times.
Continuity: The positioning of the sheet covering Reggie when he is in bed with Hanrahan's wife changes between shots.
Audio/visual unsynchronized: The high school band is performing when Ned is on the ice at the very end, but shots of the band show them applauding instead of playing their instruments.
Crew or equipment visible: 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.
Continuity: 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
Revealing mistakes: 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.
Audio/visual unsynchronized: When the Chiefs come back to the locker room between periods during the championship game, the Chiefs' goalie begins yelling, but his lips are not moving.
Plot holes: 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.
Revealing mistakes: 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.
Revealing mistakes: In one of the game scenes, a shot shows one of the Hanson's passing the puck (ultimately assisting on a goal), yet Dunlop had not yet allowed any of the three Hansons to play.
Continuity: The amount of beer in Dunlop's glass changes when he sees his wife come into the bar and then asks her to dance.
Revealing mistakes: During the championship game, cardboard cutouts to fill in the "crowd" can be clearly seen in the upper levels of the arena.
Continuity: When Dunlop takes the Hansons to the hotel, he tells them that the team is on the road at 8:00 a.m. However, when the bus leaves, it is clearly at nighttime.
Incorrectly regarded as goofs: 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.
Plot holes: 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.
Continuity: 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.
Continuity: The deck of cards between Braden and Dunlop (in front of the airline carrier bag when they are on the team bus) changes positions in each successive shot.