Continuity mistake: Early into Rose's suicide attempt scene Jack's hair tucks itself behind his ears while his hands are in his pockets. (00:37:55)
Continuity mistake: Rose is attempting to commit suicide and tells Jack to leave. When he says "No", his hair swaps from being all over his face to neatly combed, between shots. (00:38:15)
Continuity mistake: When Jack is persuading Rose not to jump, Jack's shirt collar changes position several times, revealing his white t-shirt from a little to a lot. (00:39:05)
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: When Jack is talking to Rose for the first time, his hair is constantly changing position. (00:39:30)
Continuity mistake: When Jack tries to talk Rose out of drowning herself, the camera cuts back and forth between their faces. There's a strong wind blowing through Rose's hair where Jack's hair is totally still in some shots. (00:39:40)
Continuity mistake: When Rose slips during her suicide attempt and Jack grabs her right hand there's a shot from behind where her left hand is holding on to the second railing bar from the bottom. When the camera angle changes she is holding on to the bottom bar, and in the next shot again to the second. It's unimaginable that she would change her grip that frequently in this situation. (00:40:55)
Continuity mistake: When Jack gets invited for dinner after Rose's rescue his hair changes between hanging down and tucked behind his ear alternatingly. There is another change after he puts Lovejoy's cigarette behind his ear. Similar alternating changes happen while he talks to Rose in the gym. (00:43:15 - 01:14:55)
Continuity mistake: When Cal gives Rose the diamond her front hair changes from shot to shot, most drastically when she says "good gracious." (00:44:30)
Continuity mistake: When Jack and Rose have first met and are talking and walking on the promenade of the ship, in a wide shot of them, to the left of the screen stands a man with a hat in his hand talking to a lady. In the following shot his hat is on his head. (00:45:50)
Continuity mistake: On the day after Rose got the diamond she and Jack talk a walk on the deck. From the light on the deck you can tell that the sun is still fairly high up. When the camera angle changes and we see them from behind the deck is in the dark, and the sun is falling in almost horizontal. When they sit down to look at Jack's drawings the sun is higher again. (00:46:15 - 00:49:10)
Continuity mistake: The day after Jack saved Rose's life, they are walking by the upper deck, and you can see the shadows of the smoke that came out of the smokestacks over them and the ship. However, in the next shot, you can see the shadows have totally disappeared, and in the next shot they reappear, but much more faintly. Also it would be technically impossible for the shadows to be over Jack and Rose, due that the sun is coming at the LEFT side of Jack & Rose, so the smoke shadows should have been at the other side of the ship and not over them. (00:46:30)
Continuity mistake: When Jack and Rose are talking on the deck. Rose is explaining to Jack why she considered jumping. She stated that she felt that she was screaming at the top of her lungs and no one was listening. He looks at her ring and states that she'd sink straight to the bottom...yadda, yadda, yadda. If you watch that scene, pay attention to Rose's hair. One second her hair is perfectly curled with bangs, then it is behind her ears. It alternates back and forth: bangs, no bangs, bangs, no bangs until she grabs his portfolio and they sit down on the chairs to look at his drawings. (00:47:20)
Continuity mistake: When Rose is looking through Jack's sketchbook when they are sitting on deck near the beginning of the movie, Rose's hair changes form shot to shot. From one angle it is very messy, with a lot of wind blowing it around. However, from the other angle her hair is perfectly styled into ringlets around the front, with little or no wind blowing at it. (00:48:40)
Continuity mistake: In the scene on deck where Jack is teaching Rose to spit, for a split second you can see the breakers rolling in to shore through the ship's railing. Also in this scene, the angle of the shadows changes constantly, indicating the scene was shot several times throughout the afternoon and then spliced together. (00:52:00)
Continuity mistake: When Jack is teaching Rose how to spit, then gets caught by some ladies, he has a glob of spit on the far upper right side of his chin, then the shot switches and it is now on bottom middle and a little to the left of his chin. (00:52:25)
Continuity mistake: When Jack is waiting for Rose at the staircase (before dinner) he is mimicking the hand gestures of an older gentleman. As Cal and Ruth walk down the stairs, we see a shot of Jack from behind, and his arms are at his sides. In the next shot when Cal goes to greet the Countess, Jacks posture is back to the mimicking of the older gentleman. (00:55:40)
Continuity mistake: When Jack meets Rose for dinner and Cal says "You almost look a gentleman," take a look at Rose's facial expression beforehand. The shot changes from side view to front view several times and her expression changes from smiling to normal at each change of shot in under 15 seconds. (00:57:15)
Continuity mistake: When Rose is introducing Jack to the first class passengers, they (Jack, Rose and Molly) start walking towards the dining area. Cal turns around, and says "Sweet Pea", obviously calling for Rose. When it does this, you can see Rose, Jack and Molly facing another direction, still talking to J.J Astor. Next shot, they're facing Cal again, on their way to dinner. (00:57:45)
Continuity mistake: Right before dinner, Jack and Rose are talking to the Astors, and Molly comes up from behind them, asking Jack to escort her to dinner as well. In the next shot, when Cal calls back to Rose, Molly is still walking up to them. (00:58:15)