Continuity mistake: Towards the end of the movie when the cast is singing the finale song and the Argentinian comes out he walks down the stairs twice.
Continuity mistake: In the scene where the Duke and Zidler are negotiating their contract, the background decorations change a few times. The DVD commentary mentions that the scene was shot in both Madrid and Sydney and to look for hair changes, but the statue behind the Duke's shoulder is noticably different depending on the shot. One good tip is to watch for the different camera angles showing that the cameras were not in the same place.
Continuity mistake: From the beginning of the Red Room scene, until the end of "The Pitch," Christian's tie changes in a variety of ways he obviously didn't have time or opportunity to fix, considering all that hiding from the Duke. Christian's tie starts out straight, is removed by Satine during the "big boy" tumble, but later shows up again, perfectly tied during the "Your Song" dance on the roof. It disappears again after the dance on the roof ends, but mysteriously shows back up during different scenes in "The Pitch," untied, and flapping around his neck. No times listed, because its a running occurrence, on the DVD, watch closely from scenes 8-12.
Continuity mistake: In the Can-Can dance scene, there is a brief shot of Nini Legs-In-The-Air sitting down and spreading her legs as wide apart as they will go. She is dressed entirely in black. The shot changes immediately to the Can-Can dancers all lined up, with Nini standing in the middle wearing a yellow dress. She continues to wear this outfit for the rest of the scene.
Continuity mistake: When they are singing, "And they call them the diamond dogs." the black guy's hat is on, then off, and changed each time you see him in those few moments.
Continuity mistake: When Satine is singing "One day I'll fly away", Christian climbs up the elephant and encounters her. He leans on a column with a red ball. The ball keeps moving between shots, even though Christian keeps still in the same position, watching Satine. Sometimes the ball is down, sometimes up, sometimes close to him.
Continuity mistake: In the final scene, when they are performing the play before the audience, watch as Satine makes her initial appearance and rises up out of the floor. In some shots, you can see her leg sticking out through the slit in her dress, in other shots, her leg is still inside her dress.
Continuity mistake: When Christian knocks over the candle in the Red Room, the flame goes out and there is another shot of it out. Then suddenly there is a shot of the candle knocked over but still burning on the table and it's reflected in some of the silverware. Then the next shot of the table, the candle is suddenly out again.