Continuity mistake: SPOILERS: In the post-credits scene, after Henry's trap starts, in the second-to-last shot, you see him sort of start to shake and rear his head back. But then in the next shot, he's no longer shaking. Additionally, his head is down again and he rears it back a second time.
Continuity mistake: When the custodian grabs the watch out of the drawer at the start of the film, the way he's holding it changes instantly between cuts. (First he's only holding it in his right hand, then he's suddenly holding it with both hands.)
Continuity mistake: When Valentina grabs the wire in front of her neck and cuts her hands, the blood pattern changes between cuts. (There's suddenly less blood in the second shot, revealing it's a different take.)
Continuity mistake: When Gabriella is kidnapped, as Amanda approaches the door of the stall she's in, the way she's holding her purse changes between shots. When it cuts to the angle above, the straps go from over her hands to under her hands.
Continuity mistake: When John is fixing Carlos' bike wheel, throughout the scene, it is leaning backwards towards John. However, right before he pulls it out of the vice, it is suddenly leaning forwards towards Carlos. (John never pushed it forward.)
Continuity mistake: When John puts Carlos' bike wheel in the vice, his right hand goes from cranking the vice to holding the side of the wheel as it cuts to Carlos.
Continuity mistake: After Cecilia points out Carlos and his father to John while showing him around, they begin walking again. John goes from walking a few feet behind Cecilia to right next to her between cuts.
Continuity mistake: When John is watching the video of Cecilia, he reaches up and puts his right hand against his face. It then cuts to the opposite angle, and suddenly it's switched to John's left hand being against his face.
Continuity mistake: When the custodian twists the dial to position two on his trap, his fingers go from extended to curled instantly between cuts.
Continuity mistake: When the custodian parks his vacuum near the hospital bed at the start of the film, in the first shot, his vacuum is near the middle of the bed. The camera cuts, and suddenly it's down near the foot of the bed.
Continuity mistake: Amanda has no blood on upper lip before Cecilia brings Carlos in, but does in the following shot after Cecila is back inside with Carlos. (01:36:21 - 01:36:59)
Continuity mistake: Henry writes down the web address "theperdersonproject.net" on a napkin for John. In the next scene, when John checks the napkin, the writing is slightly different. It almost matches, but a few of the letters are ever-so-slightly bigger or smaller, and the spacing is subtly different.
