Continuity mistake: When Joker sees himself for the first time he hits the light and the bulb smashes against the wall. In the wide shot the light is still swinging and you can see that the bulb is intact.
Continuity mistake: At the cathedral scene, when Batman & Vicky are hanging at the ridge, and the Joker is about to be picked up by the helicopter, the color of Joker's jacket changes from purple (front shot) to red/orange (shot from above) and back again. The orange one may be his blouse, as it has the same colour visible under his jacket in the front shot. Then, the same jacket and hat are seen hung over the gargoyle just a few seconds later.
Continuity mistake: When Batman and Vicky are running from Joker's museum plot, and are running from Joker's henchmen, he shoots a cable up to a walkway. As the camera shows him firing, he fires the rope at a 45 degree angle, yet when he and Vicky are going up on the rope, the walkway is directly above them and the rope is perpendicular to the ground.
Continuity mistake: When Joker comes to Vicki's apartment, Joker shoots Bruce and Bruce plays dead. As he plays dead, his right hand changes positions between camera angles.
Continuity mistake: When Vicki and Bruce take their plates to finish the supper in the kitchen, Vicki grabs her glass twice.
Continuity mistake: When the Joker is watching the pictures that his henchman gives him, he puts the one with Alexander Knox on the table. Then, he looks at Vicki's picture and there's now another picture on the table.
Continuity mistake: Vicky Vale's first name is V-I-C-K-I in the credits. On the cover of the magazine, it's spelled V-I-C-K-Y.
Continuity mistake: When Batman collects the balloons' cables in his flying vehicle's anterior contraption, he gets 6 or 7 cables caught, but when he closes the scissor-like mechanism, there are only 5 visible cables. Also, when he collects them, they gather at the back of the mechanism, but when he closes it, they are neatly caught in small notches.
Continuity mistake: After electrocuting the guy at the end of the table in the crime-bosses scene, Joker (Jack Nicholson) clearly tries to put the scarf into his chest pocket but fails and lowers his hand while still holding it. But in the next shot the scarf is perfectly in place.
Continuity mistake: Whenever shots show the view looking down on the ground when Batman and Vicky are hanging from the cathedral, it only shows two spotlights shining upwards from the ground. In other shots just showing the upper part of the cathedral, there are three or four beams visible. Also, the movement of the beams from the ground and the ones actually on the actors don't correlate between shots.
Continuity mistake: When Batman is first seen at the beginning of the scene at Axis Chemicals, he pulls a thug over a rail and hangs him from it. But when we see Batman standing over the rail, the thug is hanging from a pulley on the ceiling.
Continuity mistake: The clown balloon was swelling with the Smilex gas, but when Batman steals it and flies it and the other balloons away, it's back to normal shape.
Continuity mistake: In the scene where the joker fires at Batman using his extra long gun, the barrel is straight and solid, yet when he is forcing Vicki up the Cathedral steps, he collapses the gun into a pistol.
Continuity mistake: As Lt. Eckhardt approaches Napier, Bob the Goon is behind Napier, polishing the upper part of the driver's side windshield of Napier's car. Also in the close-up of Napier. When the camera quickly shots to the long shot again, Bob is now working on the lower part of the windshield.
Continuity mistake: Before and after his transformation, the Joker a.k.a. Jack Napier, has brown eyes, but in the flashback, he has blue eyes.
Continuity mistake: When the man is knocked out in the alley he changes positions between shots.
Continuity mistake: Notice The Joker's chin in the bell tower. It's covered in blood when first shown, a shot later it's suddenly just the center of his chin.
Continuity mistake: While Vicky is talking with Bruce at the Batcave she has some tears on her face which disappear between shots.
Continuity mistake: When the Joker is giving the money to the people a bill sticks on the top side of the throne which disappears and reappears between shots.
Continuity mistake: While Bruce is talking with Vicky at the Batcave he is clean shaven, but after he attacks Axis chemicals he has some stubble on his face.
Suggested correction: The balloons were not filled with Smilex gas. The Smilex was in canisters that are visible underneath the balloons. The balloons themselves could have expended and contracted due to varying air pressure.
wizard_of_gore ★
Yes the canisters were on the underside. But if you look closely, when activated, the balloon began to swell, and holes appeared, releasing the gas.
Movie Nut