Lummie

Continuity mistake: At the part when Jack or Rose (I can't tell which) wipes their hand on the fogged up window, they show it again in the next shot and you can definitely tell it's a completely different handprint. (01:32:00)

Visible crew/equipment: When Jack comes to the first class door for the first time in his tux, you can see a cameraman in the glass door just before he enters. (00:54:55)