Revealing mistake: When Charlie shoots the cow there is no bloodshed at all, even though the cow is supposed to be alive. (00:31:20)
Revealing mistake: At the start of digging the tunnel, one of the characters (I think Denny) calls Woody Allen, "Woody" by accident.
Revealing mistake: When Mel Gibson is in Marisa Tomei's apartment he goes to the WC to talk with his "little friend". He just got out of her bed and he is supposed to be naked. While sitting on the toilet he is filmed from the waist up but you can clearly see on the left corner of the screen that he is wearing a dark piece of underwear.
Revealing mistake: In the scene where the Klumps go to the "All you can eat" restaurant, Sherman sits at the corner of the table next to his father. When he sits he puts his hands on the table. His father does the same, but because the actor is edited into the scene the fathers hand goes through Sherman's hand. Both hands are on the same place on the table, and you can see through them. (00:12:10)
Revealing mistake: In one of Renato's fantasies about Malena she comes into his dark bedroom. The light is falling into the room from the hallway, but when she walks through the room she casts a second shadow created by a stage light. (00:16:20)
Revealing mistake: When Elliot appears in the fountain, after the sensitive guy segment, water is already up his trouser legs. (00:44:50)
Revealing mistake: At "El Beachio," when Kevin and Perry order the two lovely ladies a drink, you can briefly see that the glasses are already nearly empty as the waiter gives them to the girls. Presumably, this was done because the girls are expected to nearly finish their drink in a couple of seconds before making a sharp exit due to the embarrassing fake phone call Candice just made. (00:27:35)
Revealing mistake: Joseph White is having his glasses fixed by Ann. Ann asks a local passer by for some fishing line from her fishing kit. As the glasses are being fixed Joseph gets a fishing hook stuck in his finger. At first we see the hook embedded in his finger, but in the next cut we see Joseph showing the finger and hook to Ann. You can see that the line and hook are tied around his finger.
Revealing mistake: The algae in the "garden" is fake. It is cloth.
Revealing mistake: In the shot where Ben Stiller and Jenna Elfman are in the hallway kissing goodbye, it's obvious that Ben Stiller is standing on something to make him the same height as Jenna Elfman, who is much taller than him in real life.
Revealing mistake: In the first few shots of Cheryl having sex with Leon you can see she has strips of white tape on her chest discreetly covering her.
Revealing mistake: When the priest is running and jumping down the stairs to the subway, he bounces up again, as if he fell on a mat. (00:15:25)
Revealing mistake: When one of the civil cops knocks at Jimmy's door it is obvious that someone behind it (from the movie crew) opens it. He doesn't knock hard enough to make the door slide open by itself. (01:47:45)
Revealing mistake: When the guy with the hand missing is playing his guitar, you can see his actual wrist bending underneath the fake arm that covers it.
Revealing mistake: When the killer is in the shower, he is supposedly nude, however one can see his flesh colored thong he is wearing for modesty.
Revealing mistake: When the "dudes" are taking out a load of bin bags, you can see through the lighter coloured ones that they are actually filled with polystyrene chips (the packing kind) rather than any litter.
Revealing mistake: When Deebo is getting attacked by Joker's dog, you can see protective padding on his arm.
Revealing mistake: In the bowling alley scene where Jeremy and Nick are discussing the red-haired woman, you can see Nick shaking from laughter and even hear it. It is easier to spot if you have watched the outtakes. Nick simply could not contain his laughter during this scene and so they just shot him from behind and left it in. This happens in another scene as well, when they first enter Jeremy's "manly" den. These two were just having too much fun filming this movie. Watch the outtakes.
Revealing mistake: When Sarah and Gretchen share the shower with Sebastian, you can see flesh-coloured underwear on their hips, to protect their modesty. (00:35:00)
Revealing mistake: When Roro is fighting Yasmin's brother in the car, he uses the handbrake, and the angle change to view from the top. You can then see a lot skid marks on the road where they did this stunt in previous takes.