Continuity mistake: Toward the end if the movie when Castle goes to Saint's compound to exact his final revenge, the first guard he kills is with a bow and arrow. Castle shoots him in the back but when the guard falls forward he reveals Castle on a perch directly in front facing him.
Continuity mistake: At the end when Frank ties Howard's leg to the car, Howard's arms are on his stomach, then extended out, then on his stomach, then out again.
Continuity mistake: On the pier, where Frank's wife and son are killed, his wife is in the background lying flat on her back, dead. Later in the same sequence, she is suddenly lying on her side.
Continuity mistake: When Frank is at Saint's building, he starts throwing money out the window. Problem is, its showering down in single bills and it is originally wrapped in bundles. The cart is stacked to the top and it would take time to unwrap all the bundles.
Continuity mistake: When Quentin pulls out Dave's eyebrow ring, there's no ring in the pliers.
Continuity mistake: When Frank reveals himself to the public in front of a group of reporters and two former co-workers - when we first see him, you can see he is wearing a black button-up shirt that is buttoned all the way up, except for the top two, revealing that he is wearing his skull t-shirt underneath. (You can see the top of the skull peaking out.) But a few shots later, the bottom half of the shirt is completely unbuttoned (only one button is actually buttoned up), with him having no time or reason to do so between shots. In addition, when the bottom half half of the shirt is unbuttoned, you should be able to see the rest of the skull, but you can't. You can tell the skull just sort of stops midway down the shirt, revealing that he is wearing an alternate version of the t-shirt that only had the top half printed on it, so it would be just visible peeking out of the top of the button-up shirt.
Continuity mistake: When Howard Saint is in the limo after burying his son, he gives instructions to his best friend to kill Jack. His hair is wet and put back with gel. His friend says "all right", then we cut back to Saint, whose hair is now less slick. Cut away and back, and his hair is exactly how it was before.
