Continuity mistake: Just before Kitty Baxter shoots the 2nd woman sleeping with her husband, she gets a 2-handed grip on the gun. But in the next shot, she is holding the gun 1-handed and once again gets a 2-handed grip.
Continuity mistake: Near the end of the movie, after Roxie's audition, Velma is pitching her act again when Roxie puts on her coat and buttons it. The camera cuts back to Velma for a minute, then when it cuts back to Roxie her coat is unbuttoned, then seconds later she is walking through a door and her coat is buttoned again.
Revealing mistake: If you look closely at Billy Flynn in the musical number "All I Care About is Love", right at the end when he takes off the boxers, you can see that he is wearing underwear underneath them.
Suggested correction: Not only is this not clear whatsoever, since we can't see below his waist, but this is happening inside a musical number, not meant to be taken literally. It is just theatrical exaggeration for the performance.
Continuity mistake: During John C. Reilly's number "Mr. Cellophane", the spotlight angle switches between shots from directly over his head, to in front of him.
Continuity mistake: In the final dance scene with Velma at the Chicago Theater, Roxie's shoes change between the early shots and later ones.
Continuity mistake: In Roxie's first press conference, in certain shots you can see a bit of misting. In others you don't. This suggests that the scene was shot over several days or at different times of the day.
Visible crew/equipment: In the "Roxie" number, just after Roxie sings "that means somebody everyone knows" she goes down a line of mirrors and as she does you can see three crew members with what looks to be a camera in front of the middle one. Their figures are somewhat dark, so it's a bit hard to see, but it's there.
Continuity mistake: When Velma approaches Roxie with some chocolates, she offers her one. Her fingers are under the box, and her thumb on the top, but when the camera changes angle to face Roxie, Velma's thumb is on the side of the box. When the camera goes back to focus on Velma, her thumb is back on the top.
Continuity mistake: In the final dance scene, there are supports on the ground for the machine guns when Roxie and Velma are not holding the guns. These supports disappear when Roxie and Velma are holding the guns.
Continuity mistake: When posing for the photographers at Roxie's trial, whenever we see Billy and Roxie from the front, Billy has his arm all the way around Roxie with his hand resting on her stomach. Yet whenever we see them from behind, his hand is resting in the middle of her back.
Continuity mistake: In the scene where Velma offers Roxy some chocolates, Velma puts the box down on her left. In the next shot, it is at the corner of the table, on Velma's right, with the long side facing Roxy. In the next shot the short side is facing Roxy, then the long side again.
Continuity mistake: In the scene where Roxie gives Velma her laundry the money in Velma's top moves from hardly seen to almost all the way out.
Continuity mistake: In the puppet scene, Renée Zellweger's legs are often in a different position from one shot to another, sometimes closer and sometimes further away.
