Other mistake: When Jackie meets the boss of the Interpol department in Ireland, he shows everyone some sketches, the child and then a man with a hat. If you watch the picture, it changes from a man with a hat to another man without a hat back to the man with the hat and once again back to the man without the hat.
Continuity mistake: When Jackie and Watson are driving Watson's car right after they've been on a video conference with all the professors, they park the car. We see Jackie has his seatbelt on, but when it cuts to him breaking the door off the seatbelt is no longer on him. He could not have removed it that fast.
Continuity mistake: In the beginning when Snakehead has received the book from the old man he says "The only pitiful is your life". He grabs a knife and we see him stretching his arm out against the old man. When it cuts Snakehead has his arm bent with the knife under the old mans chin. The way Snakehead stretched his arm he would have stabbed the old man right in the face, not placing the knife under his chin.
Deliberate mistake: When Jackie tries to avoid the Jamaican guy he jumps up to a higher deck. As we see him duck out of sight it takes him about 1 second to get to the other side and jump down there. However it's at least 40 feet to get to the other side. Jackie is usually fast but not that fast.
Continuity mistake: On the ship when Jai manages to run away he runs through a door in to a corridor. The bad guys follow him and we see them enter the doorway as one of them shouts "Come on, he went this way.". When it cuts to Jai still running the men can't be seen in either the doorway or the corridor.