Character mistake: When Darcy walks into the police station the chief calls her Joan, the lead actress' real name, by mistake.
Character mistake: When Simon Dermott, a world-renowned museum security expert, steals the fake Cellini statue from the stand, he replaces it with a wine bottle, carelessly leaving his fingerprints all over the glass.
Character mistake: Twice over in the movie (when Healy wakes up and when March at the end of the movie drives to his place) billboards for The Comedy Store appear. The program of the evening features comedians such as Tim Allen, Richard Lewis, Robert Klein and "Elaine Boosler." So they misspelled Elayne Boosler's name. (00:10:50 - 01:48:35)
Character mistake: Bart is sitting on a bench outside the hotel. After Detective Espada talks to the Mercer hotel manager/owner, he goes to talk to Bart. Bart has blood on both hands and lower left sleeve. Detective Espada is supposed to be investigating a fresh murder case that puts Bart at the scene, but he does not confiscate Bart's bloody clothes, conduct a gun powder test on Bart's hands to check for residue, or take him to the police station for formal questioning. Espada did not follow police protocol. (00:17:36)
Character mistake: When The Plague starts talking at the meeting and comes up with the story about a hacker planting the virus, he first says that an "unknown intruder" was the one who broke in, but only minutes later says that the cops picked up him already. (00:34:40)
Character mistake: In the opening scene where Olek Krupa is looking at flight departures at San Francisco Airport, you can briefly see two entries that say "San Frnsicso." (00:05:30)
Character mistake: Luca calls Eve in the dark outside the house, searching her. But they all know that Eve is deaf. (00:33:20)
Character mistake: At the end of the movie, Darryl tells Calvin they don't have a back door. There's a back door in the kitchen and another door that goes back to the backyard patio.
Character mistake: When the platoon is walking to the village the next morning after the firefight in the jungle the previous night Brownie is shown walking with no sleeves on his fatigues then later on right before he's shot and killed by the VC he's shown with sleeves on but rolled up when talking to Ericsson near the farmer in the rice paddy.
Character mistake: When Walter brings Cynthia's dog in the carrier to the bowling alley he refers to it as a Pomeranian while it is actually a terrier. Somewhat related, when the the Nihilists confront Dude in the bathtub, the dude refers to the ferret as a marmot. Walter later refers to the ferret as an amphibious rodent. Perhaps he was thinking of a mink.
Suggested correction: These were purposeful taxonomic (funny!) jokes.
Character mistake: Whenever Catherine visits the Baroness with young Estella, before she gets murdered, she asks the Baroness for money so that her and Estella could start a new life. Since Estella is being spoken about, the Baroness is aware of her at this point. However, later on in the movie, the Baroness questions John, "What did you think I meant when I said take care of the problem?!" Implying she thought Estella had already been killed when she was a baby.
Character mistake: When Erickson is telling Strahm that he no longer has any jurisdiction over the Jigsaw case, he mentions that over a dozen dead bodies were recovered at the meat packing plant, including two cops. There were in fact only 10 dead bodies: Danica Scott, Judge Halden, Timothy Young, Jeff Denlon, Lynn Denlon, Jigsaw, Amanda, Art Blank, Officer Rigg, and Detective Matthews. (00:20:28)
Character mistake: When David Frost interviews the fictional actor Bryan Martin, he adds a last question to the interview saying "before you go" and acts as if the guest is not gonna stay (as it often happens in talk shows, when some guests, especially the more famous ones, leave after their bit is over). However Martin is staying and in fact there is a special mystery guest a bit later that makes sense only if he is in fact staying. (00:02:00)
Character mistake: When Chafuka is controlling the zombie Barry with her voodoo doll, he's supposed to be repeating her words so precisely that he even imitates her accent. But when she says "that darn fool paper, it fall on the ground," Barry repeats it as "The darn fool paper fell down to the ground."
Character mistake: When Big Nick and his team are first discussing the theft of the armored truck early in the film, Nick is eating and turns to one of his partners and asks for him to give him the "Pepto", or pepto bismol. You can see in this shot the bottle of pepto bismol is already sitting on the desk next to the guy, but then the guy opens the drawer and mimes the movements acting like he's pulling it out and setting the bottle on the desk. (00:23:25)
Character mistake: When Henry Fonda is led to his cell, shot in a prison in Queens, a real inmate yells "What'd they get ya for, Henry?"
Character mistake: When on the phone to the police officer Sgt Halloran, noodles calls him Aiello. Danny Aiello is the real name of the actor.
Suggested correction: In the scene you're referring to, the person Noodles calls, and the character Danny Aiello plays, was the police chief, not Sgt Halloran. In the film, Danny Aiello is credited as Police Chief Aiello. Also, his wife (played by Karen Shallo) is credited as Mrs. Aiello.
Character mistake: Dooley refers to his car several times, saying "my 1965 Mustang." It is actually a 1966 Mustang.
Character mistake: In the morgue, the Captain says the latest victim brings the total up to 16. However, prior to the killing, the news report said there's been 16 victims. This is the 17th victim.
Character mistake: Being a doctor she leaves Frank the meds he needs to retain his feminity yet she doesn't leave what he needs to stop facial hair. Such things exist.