Continuity mistake: Right after Jay and Silent Bob run off the Good Will Hunting 2 set from the security guards, they run outside and Jay's jacket is tied around his waist. Then, they run into the Scream movie set and he has his jacket on. As soon as they run out of the Scream movie set, his jacket is tied around his waist again.
Continuity mistake: When Jay and Silent Bob first get into the van with the girls and Brent, Brent reaches out to squeeze Justice's thigh with his left hand, but as the the camera picks up the actual squeeze, its Brent's right hand squeezing her thigh.
Continuity mistake: Near the end when Jay and Silent Bob fight Mark Hammil, Jay takes out the double sided bong saber and takes a hit from it; you can see the plastic lightsaber part of the other blade in the corner of the screen. It's white and green.
Continuity mistake: During the last scene with Morris Day and the Time performing on stage, after Jay kisses Justice she makes "Kissy" faces at him. When the camera cuts, she is no longer doing so.
Continuity mistake: During the shootout at the end, J and SB are hiding behind the car and a shot pierces the car between their heads. In later wide shots, the bullet hole is missing.
Visible crew/equipment: When Jay and SB are kicked off the bus and are bitching about it, a boom mic is reflected in the back window of the bus.
Continuity mistake: In the scene where George Carlin is telling Jay and Silent Bob about hitchhiking, the pole thing behind them appears and dissappears from shot to shot.
Continuity mistake: During the scene where Brodie talks to Jay and Silent Bob about Bluntman and Cronic, he shows them a copy of Wizard magazine with a related article. On the right page is a picture of Holden and Banky. They then take this magazine and eventually show Holden McNeil the same article. The right hand pictures are different from how they were before.
Continuity mistake: In the scene when Wildlife Marshall Willenholly joins the Utah Police in front of the Diner, the police cars move closer together and farther apart to allow for the marshall to walk from behind to in front of the cars.
Revealing mistake: When the girls are shooting at Marshall towards the end, in some shots you can see they aren't really pulling the triggers and that the muzzle-flashes have been added with special effects.
Continuity mistake: When Holden is reading the posts on moviepoopshoot.com, the right side of the browser window changes positions. It will change where the window takes up the whole screen, to where the window is smaller and you can see several icons to the right of the window.
Visible crew/equipment: When Ben Affleck is talking to Jay and Silent Bob in his 'Casa' near the start of the film, on the furthest shot you can see a guy or girl on the right of the reflection on the computer's coloured monitor. This is obviously a crew member because at one point, when Ben is talking, you can see the person moving around.
Other mistake: During the credits of the movie, after Morris Day points to Jay and Silent Bob, there is an Asian guy jumping up and down at the far right hand corner. The shot switches back to Morris Day and when the shot goes back to Jay and Bob the Asian guy is wearing a light beige hat. The extra submitted this entry himself - he was wearing the hat during the shots. Then after several takes someone in costumes noticed it was a major logo ("No Fear") so he had to take it off. The shot was used before he had his hat on.
Revealing mistake: When the girls do their 'Entrapment' routine jumping through the lasers at the diamond vault, you can see them cut through the beams with their arms, legs, and hair.
Continuity mistake: In the scene where Jay and Silent Bob are getting busted, the cop is holding the pack of "wraps" in the air. When the shot changes so that Jay can pull down his pants, the cop's hand is down.
Revealing mistake: When Silent Bob is typing the message on the website about their revenge on the people who have bad-mouthed them, he just taps the last row of keys but there is a lot of writing put in the message.
Continuity mistake: Towards the end of the film when Jay and Silent Bob battle Mark Hamill, Jay cuts off Hamil's huge hand, and you see it drop to the ground, and you see his smoldering arm with no big hand. In the next shot when Mark Hamill is fed up and marches off camera, you see he once again has his huge hand attached to his body.
Continuity mistake: When Chris Rock's assistant brings him a cup of coffee, he hands Chris the cup, then the cup is back in his hand, then back to Chris' hand again.
Continuity mistake: Near the end when Justice is talking to Federal Wildlife Marshal Willenholly after he's been shot by the orangutang, Justice's hand moves between shot. It goes from knee to floor and changes several times.