Revealing mistake: When the cop find Rose's necklace in the coat, Jack says "he put it in my pocket" and Cal tells him to shut up. Right then, he turns his head and the glue of his wig is noticeable around his temple. (01:41:30)
Continuity mistake: When Jack is about to start drawing Rose, the shot cuts back and forth from a close-up to a wider shot. In the wide shots Jack is holding his charcoal pencil, in the close-ups he is not holding it. (01:23:10)
Factual error: In the scene just before the spitting lesson when Rose and Jack are strolling on the deck, you can see Pacific ocean shore waves breaking towards the ship. (00:51:45)
Continuity mistake: The drawing of Rose by Jack which Cal finds in the safe changes when the divers later find it in the wreck.
Suggested correction: Actually it does not. Comparing side by side the pictures they are identical. The actual picture seen (drawn by James Cameron) was sold at auction in 2011.
Continuity mistake: When Jack and Rose are running through the dining room, both of them are completely dry and running up. After Cal tells Lovejoy he'll give him the diamond if he gets it back, we cut back to Jack and Rose and both of them are soaking wet, most noticeably Jack. (02:13:15)
Revealing mistake: In the scene after Jack and Rose try to save the child from the Italian guy, when the water bursts through the doors, they run away from it. But take a close look at Jack's neck: you can see the edge of a black wetsuit. And under his entire shirt, it's a little darker than it is a few moments later when they try to open the gate. (02:16:45)
Visible crew/equipment: When Jack and Rose enter the car to make love, cameras, shades, boom mic and studio structure are reflected on the brass parts of the car. (01:29:30)
Continuity mistake: While with Fabrizio on the front of the boat, Jack's hair moves wildly, yet a frame later, from a different angle it's still. (00:29:50)
Revealing mistake: When Rose is about to commit suicide and Jack approaches, their skin turns pale and slightly blueish due to the green screen effect. This happens in all the wide angles from this scene where a big part of the sea and the horizon are visible. (00:38:30)
Continuity mistake: After handcuffing Jack, Lovejoy says the initials on his coat and Jack turns to Rose. A frame later, from a different angle, he is looking away. (01:41:35)
Continuity mistake: After Cal throws Rose's cigarette away, she lowers her hand. Then there's a very brief angle on Molly Brown where Rose is lowering her hand again up to a point where it disappears offscreen. Then a millisecond later it cuts back to Rose and her hand is magically raised and still, no sign of her lowering it, and shortly after she lowers it while Cal extinguishes the cigarette and she places her index finger on the holder. Close-up on Rose and her fingers are in the previous position and she is extending her index finger again to hide the holder. So there's actually 2 mistakes in a lapse of 3 seconds. (00:32:10)
Continuity mistake: When having lunch, Cal takes Rose's cigarette off of her hand and talks with his hand next to his jaw. Depending on the angle, the hand is up or down. (00:32:30)
Other mistake: After the "flying" scene, the story cuts back to real time. When it starts to transition back to the flashback, the camera zooms in on a television screen with the fireplace in it. This screen is 1) also used in the beginning of the movie 2) impossible, seeing how there was only one ROV in that room, and it shows the ROV in it. (00:06:15 - 01:20:10)
Continuity mistake: When the alarm sounds in the boiler rooms, the officer shouts "Shut all the dampers." We see all of the firemen shut all the loading doors to the furnaces. But a few clips later, when water pours in, the water flows past open furnace doors. (01:35:00 - 01:37:20)
Continuity mistake: About half an hour in when the rear of Titanic is shown, look at the very rear of the ship and you will see a red sign (near the triple screws) to the right of an over-hanging light. Shortly afterwards when Rose approaches the rear of the ship to jump off, the sign has now moved to the other side of the light. (00:31:50 - 00:36:15)
Continuity mistake: After making love, Jack says to Rose "Don't worry, I'll be all right" and kisses her, sucking the upper part of her lip. When the angle changes, he is sucking the lower part. (01:31:50)
Continuity mistake: About to jump off the boat, Rose says "You're crazy" and looks at the sea. A frame later, her head is turned towards Jack. (00:39:10)
Continuity mistake: In the scene where Jack and Rose enter the water, Rose is barefoot, yet later she is wearing pale shoes: the heels are visible later when Rose is on the floating door. (02:36:50)
Revealing mistake: When Jack and Rose are talking at the bow of the ship before the "I'm flying" part, if you look at the windows behind them you can tell it is a painted prop area and not a real ship.
Other mistake: After Jack and Rose are "done" in the cargo hold, they come out onto the bow of the ship laughing. Whilst the door they used to get onto the bow does lead to the cargo hold, inside you have to go down a flight of stairs and are greeted by a cast iron hydraulic door which can't be opened from inside the cargo hold, and would close automatically if the control wheel wasn't being held. The only way they would have been able to get out is by running back through the boiler rooms.
