Continuity mistake: When Robert's boss comes in to fire him, the distance between them suddenly shrinks when the shot changes. (00:05:50)
Continuity mistake: When Celine's father is lecturing her we see her bag parallel to the side of her chair but when we see an overhead shot of her, the bag is at a different angle. (00:11:55)
Continuity mistake: When Robert is first attacked by the security guards he grabs a gun from them and warns them off. As they back away we see two baseball caps either side of him but when the shot changes to behind him there are three baseball caps directly behind him. Also, the distance between him and the nearest guard gets bigger. (00:13:15)
Continuity mistake: Observe the position of the material Robert uses to tie Celine and her hands. In the front shot both hands are resting flat on the arms of the chair but from above we see them hanging over the end. More obviously, when Robert secures her right arm, he ties her right wrist directly to the chair but for her left arm the material is tied over the sleeve of her coat. When the shot switches to overhead, we see the bonds on both arms are tied round the sleeves of her coat. (00:19:15)
Continuity mistake: When Robert makes his first attempt to collect the ransom, we see that when he first gets out of the car his shadow is pointing towards the 2 o'clock position (assuming he's facing 12 o'clock). But a few steps later when the shot changes, his shadow has moved to the 11 o'clock position. (00:36:00)
Continuity mistake: When Jackson is tying the bag to the rope, his shadow is directly behind him but in the overhead shot his shadow sticks out to the right of him and then in the next shot, his shadow has remembered to be behind him again. (00:51:50)
Continuity mistake: When Robert is digging the grave, Jackson is talking to him, sitting on the ground with legs crossed. There is a cut to Jackson's back, and a few seconds later a front view shows him with legs out-stretched. (00:59:00)
Continuity mistake: When Robert finds Celine after she has been kidnapped by O'Reilly and Jackson we see several times that O'Reilly has bled from her left nostril and the blood has run down onto her bottom lip. After she gets shot, the blood stops at her top lip. (01:22:30 - 01:23:50)
Continuity mistake: When Jackson is playing cards with Celine, the arrangement of Celine's cards changes depending on the camera angle without anyone touching them.
Continuity mistake: When Celine is tied up playing blackjack, the position of the rope holding her varies. We see for example that the number of times the rope crosses her chest goes from three to four and back again.
Continuity mistake: When Cameron Diaz points the gun at Ewan McGregor in the bank, in some shots it's pressed against his forehead, and in others it's a few inches away.
