Continuity mistake: When Bobbi, Roger, and Jo break into Sarah's house, just as they hear the noises upstairs Roger's arms change from at his sides to crossed. (00:33:25)
Continuity mistake: When Patience Phillips wakes up after robbing the jewelry shop, her hand goes up to her bed and there are a bunch of jewels. She has a ring on that hand, however, as she gets a bag and puts everything in it, the ring is gone. She then finds that ring mixed in with everything, and tries it on the left and then right hand, where it stays. In the next scene as she keeps putting stuff into the bag and then finds the necklace, when she holds it up, her hands are visible... guess what? NO RING.
Continuity mistake: When Viktor and Amelia are having dinner in the terminal, Enrique fills her glass very full. However, in the shots with only Amelia, the wine level changes to be significantly lower, though she never touches the glass. (01:26:00)
Continuity mistake: When Hellboy is walking at one point, holding his gun up in his left, gloved hand (just after one of the agents has said "This place is like swiss cheese"), watch the frame. It switches suddenly so his right hand (the stone one) is his left, and he's holding the gun in his "right." (00:59:40)
Continuity mistake: When Maggie is first shown in her hospital bed, you see her left eye is closed and swollen from the fight. Then, you see her left eye normal, then it goes back to swollen and shut. (01:33:20)
Continuity mistake: When Officer Jenny throws a life buoy to Professor Lund, it has strips, but in the next shot, the strips disappear. Also, the rope on it is tied around it three times, but in the next shot, it is tied two times. (00:48:06)
Continuity mistake: When Hiram, Juan and Kelly first see Old Fred's wagon in the distance, the white tarp on it is draped across it and down one side. When they arrive at it, it's draped differently. They also arrive at it from the side, when they were approaching from straight in front on it. (00:46:15)
Continuity mistake: In the scene when Harold and Kumar go into the girl's bathroom and hide in the middle stall, you can see all of the stall doors are closed. When the twins are standing at the mirror in the bathroom, you can see in the mirror that the stall door behind the twin in pink is open, and then it is closed again. (00:23:45)
Revealing mistake: After the El Dorado hits Boone's car and is just about to drag it, there is a quick glimpse of its front license plate. The letters are reversed, indicating that it is a flipped shot. (00:28:20)
Revealing mistake: When Alfie goes back to see Julie, he stands in the street, apparently looking towards the cafe, but we can see the cafe (and especially the building next to it with red awnings) in the distance behind him. (01:08:30)
Continuity mistake: When Tyler injects Brigitte for the first time at the hospital, look carefully at the syringe. You'll see that in the first shot its content is 1/3, and in the following shot is now 1/2 full.
Continuity mistake: When Jessica finds the gift box of roses outside her apartment, there's a closeup of the card signed "Ray", then a few shots later in the next closeup of the card the signature "Ray" is entirely different. (00:56:00)
Revealing mistake: In the Arena Challenge scene, the statue of Toa Lhikan falls on the herd of Vahki and part of the statue's mask is going through the ground. (00:22:30)