Revealing mistake: When Lindsey runs to answer her phone after she asks Slevin to explain why he was still wearing a towel, you can see the tattoo on Josh Hartnett's left shoulder blade coming through the makeup.
Revealing mistake: When Phoebe is looking at herself in the mirror, she's trying to find out why she isn't attractive enough for roles. When she takes her bra off and inspects her breasts, it's painfully obvious that that is not her real torso, as her head kind of bobs around in a strange fashion, showing that her face/head was superimposed onto another woman's body.
Revealing mistake: When Michael fast forwards through traffic for the very first time, right before he hits the slo-mo button on the female jogger, if you look inside the circle part of the remote, the graphics are missing.
Revealing mistake: When the speaker during the first game played says "This game might have had a different outcome", everyone in the crowd looks at a different spot, but the small kids agree on just looking straight into the movie camera. (00:01:25)
Revealing mistake: In the badminton scene when Sadie flashes her breasts, her chest and abdomen are much more tanned than her hands and face are. The makeup people didn't match up the body double's skin tone to the actress'.
Revealing mistake: When Langdon comments on the geometric pairing of the two pyramids you can tell the point of the crystal pyramid is slightly to the left of the point of the other pyramid.
Revealing mistake: When Chev discovers he's been poisoned and picks up the TV, you can see it's not turned on, nor does it have any wires. (00:04:00 - 00:05:00)
Revealing mistake: They let us see the stunt double's face for the girl Steven Seagal is fighting in the ending Cathedral scene, and she looks nothing like the actress.
Revealing mistake: Many of the shots of Champ preparing for the race are reused numerous times throughout the scene. Specifically, the overview shots of Champ driving, the shot of Champ driving around a corner and the shot of Coupe and Wrangler watching Champ on the television. (00:12:25)
Revealing mistake: After the scene with the apothecary where the two eunuchs purchased the belladonna it then cuts to Esther, and in her closeup as she lifts the silver cup to drink, there's a small white modern sticker on the underside of the cup. (01:02:00)
Revealing mistake: When the American man throws a square concrete tile at the monster it reacts (moves its foot in pain) before the tile actually makes contact. (00:16:11)