Continuity mistake: During the infamous leg un-crossing scene when Sharon Stone is being interrogated, a cigarette in her hand disappears and then reappears.
Other mistake: Towards the end where they steal the chip, they are detected and about a million security guards are all running around, yet 30 seconds later, the only security guard is one man with a shotgun. What happened to their big army of security guards? (01:41:30 - 01:42:55)
Suggested correction: This isn't a mistake. Bishop had been directed to a part of the building where there weren't any security guards; this was shortly before one of the guards found their camera feed. The guy with the shotgun was the only person to head into that location. Unlikely maybe, but possible.
Visible crew/equipment: When Helen and the Candyman are in the psychiatrists' office, Candyman flies out of the window backwards. If you look very carefully, you can see the harness that pulls him backwards.
Revealing mistake: This is toward the end of the movie. The scene where Dr. Giggles has a waiting room full of his victims. If you watch closely, you will see the blonde corpse blink her eyes.
Continuity mistake: During the trial at the end, Jessup struggles with the MPs to get to Danny Kaffee. After the struggle, his tie is all out of place. In the following close-up shots, it's re-aligned, before becoming completely askew as Jessup goes to retrieve his hat.
Continuity mistake: Betty Lou is in the grocery store at the checkout. The cashier rings through her groceries which consists of a roast, veggies, flowers, dog food and a bunch of other things (she was shopping for her anniversary dinner), but she only leaves the store with the flowers.
Continuity mistake: The beginning scene involves two kids in the finals of the school championships. Why are there only adults watching? In a children's tournament all the other kids would most definitely be watching this game.
Continuity mistake: When Levoi and Crowhorse visit Grandpa for the first time note the white and black beaded belt on the table behind Grandpa. In the beginning it hangs at the edge just at the first black stripe. Just after Grandpa trades Levoi for his glasses and hands him the rock, the belt now hangs nearly to the second black stripe. After that cut the belt now hangs in its original position. (00:37:30 - 00:38:30)
Revealing mistake: When Lance Henrickson's character gets killed, there's a close-up of his flashlight lying in the snow with a rivulet of blood flowing past it. It's very obviously fake snow, since there are snowflakes floating on top of the blood.
Continuity mistake: When Chet and Stanley asks Irene some questions (in the café, about 15 minutes into the movie) about the murder, the cigarette Irene smokes changes a few times between the shots. Most obvious is the length of the ashes. (00:16:13)