Continuity: During the hockey fight #12's helmet is off, then on, then off again.
Continuity: Ally's hair during her long monologue in the couch after making love with Holden. She has it back her ear, then on her cheek, then on the ear again.
Continuity: Cigarette ash on Holden's pant leg when in the diner with Jay and Silent Bob.
Errors made by characters (possibly deliberate errors by the filmmakers): When Silent Bob starts telling his "Chasing Amy" story Jay asks about the story as if he's never heard it, yet when they are leaving the diner Jay asks him why he keeps telling the story.
Continuity: When Jay and Silent Bob meet Holden at the diner, the lemon on the drink in front of Jay changes position back and forth between shots.
Continuity: When Holden first tells Banky he loves Alyssa, Holden takes a drag on his cigarette and never exhales. He even talks a minute later with no smoke coming out of his mouth.
Continuity: The length of Silent Bob's cigarette when giving the speech about the origins of "Chasing Amy".
Continuity: Silent Bob throws the comic magazine on the table twice times while he and Jay are in the diner with Holden talking about "Chasing Amy".
Crew or equipment visible: Holden's radio mike is visible under his shirt in the CD store when he's talking to Hooper.
Continuity: The scene with Holden and Alyssa is shot on a two-way street from inside the car, but a one way street when they get out of the car. Also, they are going the wrong way on that street (just before they get back into the car a street sign is visible over the roof of the car).
Revealing mistakes: When Holden and Alyssa are driving back with art work the speedometer does not move.
Revealing mistakes: Hooper-X is asked to sign the little boy's comic book at the record store, and as the boy walks away, the comic book is seen to be an Avengers comic (the advertisement on the back indicates that it is from the early-to-mid '80s).
Revealing mistakes: While Holden and Alyssa argue in the rain, they are standing in front of an alley where it is clearly not raining.
Continuity: When Holden and Banky are in the office with the executives, Exec. #1 isn't wearing a watch, but can be seen later on in this scene, where we can see a watch on his left wrist.
Continuity: When Banky is signing the last copy of "Bluntman and Chronic", the sharpie is in his left hand one minute and his right the next.
Factual errors: When Holden is looking at Alyssa's yearbook in the park, her photo is next to some guy with the last name beginning with P, Alyssa's last name is Jones.
Crew or equipment visible: When Holden is walking back to his car shortly after Alyssa leaves him in the rain, the camera crew is reflected in the window slightly to the left of Holden.
Continuity: When Holden and Alyssa leave their car after it had been raining for a while and argue outside, the road under the car is completely dry as though it had begun raining after the car was parked.
Plot holes: Before confessing the finger cuffs story in its entirety to Holden, Alyssa says that she and Rick used to hang out with her sisters. In the film Clerks. (1994) her sister Heather has heard of him but doesn't know who he is by sight and acts she's never met him when he tells her his name.