Character mistake: In a shot that flashes by very briefly, a London newspaper's headline is shown: "Sherlock Holmes Aides Police." "Aides" should be "aids".
Character mistake: When Garrison is leaving the house to question Clay Shaw on Easter Sunday, his wife is complaining about his working on the Sunday, and at one point calls Garrison 'Clay'.
Character mistake: After Rosemary has the baby and they tell her it died, she calls them liars. They give her an injection and she passes out. When Guy comes back, he says that the Doctor says she was suffering from prepartum (not an actual word) symptoms. It would actually be postpartum.
Suggested correction: Actually, it depends on which time her 'crazies' were from. If Guy was referring to how she acted while still pregnant, then pre-partum would be correct. If referring to her tantrums after the birth, then it would be post-partum.
The post starts. " After Rosemary has the baby...".
Character mistake: When Scorpio hijacks the school bus near the end, he says something to the effect that they are going to take Sir Francis Drake Boulevard to the Santa Rosa Airport. Unfortunately, Sir Francis Drake Boulevard doesn't go anywhere near Santa Rosa, it heads west through Marin County and ends up near Pt. Reyes. They should have stayed on the highway and kept going north to get to Santa Rosa. (01:27:25)
Character mistake: In the scene at Roger Podacter's condo building, you hear the reporter mention that he allegedly leaped to his death from his own 20th story balcony. As the camera pans down, you can see the flashlights and people up on his balcony doing the investigation. This is the 2nd from the top floor. If you count the floors as the camera moves down, there are more than 20 floors to this building. The number is actually closer to 30. Even though it is difficult to get an exact count of the floors, it is still possible to tell with 100% certainty that his unit was on a floor higher than 20.
Character mistake: When the EMTs are resuscitating Dr. Harris, they use a defibrillator despite their being on a wet metal dock. Not only is this highly dangerous to absolutely everyone present, it would be completely ineffective at restarting his heart as the water and the metal would dissipate the electric current too much for it to do any good. At the very least, they would have stabilized his spine then moved him to a dry surface before beginning defibrillation. (00:08:30 - 00:09:10)
Suggested correction: External defibrillators are self grounded and so can be safely used on wet or metal surfaces. https://danboater.org/travel-health-and-safety/are-aeds-safe-to-use-in-wet-environments.html.
AEDs are indeed safe to use in wet areas - but in the film, it is not an AED that is used. AEDs are automated, and not operated by humans, so as to reduce risk. Your link explicitly states the rescuer must not have direct contact with the body: they just apply the pads, then move back. In the film, it is shown in detail that the medic applies the paddles and then operates them while still in contact with the body. The mistake stands: it's a traditional defibrillator, thus incorrectly used.
Character mistake: The laser pointer and the subtitle reads "Gemeinschaft Bank". That's wrong. It has to be Gemeinschaftsbank. (00:04:20)
Character mistake: Stallone says he knows they are in the Northern hemisphere because of the way the water goes down the toilet. The Coriolis effect has no impact on water in the toilet.
Character mistake: During the conversation in the study about who is blackmailing who, Mrs. White mentions two of her five husbands: An illusionist who disappeared and never reappeared and a nuclear physicist who was found dead at home. During the last ending, Mrs. White says "So this has nothing to do with the disappearance of my nuclear physicist husband or Colonel Mustard's work on the new top secret fusion bomb?". However, during the conversation in the study, Mrs. White says her illusionist husband had disappeared and her nuclear physicist husband was found dead at home. So the correct term would be "So this has nothing to do with the disappearance of my ILLUSIONIST husband or Colonel Mustard's work on the new top secret fusion bomb?". (00:21:05 - 01:27:35)
Suggested correction: Ms. White's nuclear physicist husband disappeared too, so the line is right.
Character mistake: In the scene when Gillian and Sally are dragging the boyfriend in to put him on the table Gillian says, "Watch his balls Sal". It is in Nicole Kidman's native Australian accent and the rest of the movie she speaks with a Northeastern US accent.
Character mistake: After the robots first attack New York City, a series of newspapers is shown. One of the headlines in the French one reads "La Tour Eiffeil est détruite". The proper spelling is "Eiffel" (00:15:55)
Character mistake: Some of Colonel Jessup's ribbons are in the wrong order, and his Combat Action Ribbon is backwards.
Character mistake: On Taylor's phone it says she dies at 8:32PM, but Beth says 7:32PM, when reading the message. (00:27:05)
Character mistake: During the meeting between Langdon, Sophie and Sir Teabing, Teabing refers to Scatoma as "the mind seeing what it wants to see." Scatoma refers to a partial loss of vision. He probably meant to use Pareidolia, which refers to seeing patterns that are not really there.
Character mistake: When the group is escaping from the killer gorillas, they find a cave and Ross say "It's a geode, a giant diamond." A geode is not a diamond at all, it's basically a hollow rock with crystal formations inside.
Character mistake: Sid deduces that Billy could be the killer because he could have used his phone call from jail to make the threatening call. However, the deduction has to be incorrect, since if it was really Billy, he could have never used the voice-changing device.
Suggested correction: This will sound pedantic (hey, it's MovieMistakes.com, we're entitled), but I don't think this is what is meant by a character mistake. Sidney isn't presenting an erroneous fact that goes uncorrected, she's explaining an idea that had crossed her mind. Billy immediately gives a plausible response and by the end of the film it's evident who'd called her. The takeaway isn't that Billy could still be the killer but that Sidney can't help but suspect him despite their reconciliation.
Character mistake: When discussing the new Pope's name (Luke) at the end of the film, Langdon says: "There have been many Marks and Johns, but never a Luke." In fact, though there have been 23 Pope Johns, there has only been one Pope Mark - reigning for 9 months in 336.
Character mistake: When Malloy first visits Frannie in her apartment, he says the girl was killed on the 15th, but when Frannie is in the cop car for the first time, Malloy's partner says it was the 11th.
Character mistake: When Marion is calculating how much she spent her math is wrong. The movie shows 400000 - 4036 = 395963. It should be 395964.
Character mistake: Early in the movie Cary Grant is on the beach and is told he has a phone call. While conversing with Bertani, Cary Grant has the handset backwards - he is speaking into the earpiece and listening to the mouthpiece where the chord is attached.