Character mistake: Right before Madison shoots the 2 police officers they show a close-up of the gun in its holster. The holster is unbuttoned. No police officer would leave his gun holster unbuttoned, especially while sitting next to a felon.
Character mistake: At the scene at the dinner table where Pat and Tiffany meet, the prescription drug "Trazadone" is mispronounced with a long A as in "trayzadone." This a fairly common drug used for depression and as a sleep aid. Any nurse or pharmacist could tell you the correct pronunciation. Interestingly, the other lesser known drugs were pronounced correctly.
Character mistake: The check written by Sam Jackson says May 2, 1858. At this point in the movie, it should be 1859.
Character mistake: Before they jump off the plane Halloran should at least have checked if Sellinger has his parachute strapped on properly, knowing that the other guy has absolutely no experience. (01:05:55)
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: When Brian, Roman and the thugs are racing to get Verone's package, Verone does a little research on them. When he looks at Roman's folder there are a couple of shots where they show information about him. If you look closely, you can see that in the last shot they refer to him as Brian and later on as "she". They also talk about his relationship problems in the next paragraph of the same shot. (00:31:50)
Character mistake: In the training room, after Randall is discussed as the record holder, the students are brought to attention. All but one is standing at attention, he is in the back on the right hand side, standing at ease.
Character mistake: There is a misspelling on the cover of the issue of Forbes magazine shown in the presentation about Stark's life. It reads "Tony Stark takes reigns at 21". The correct spelling of the word is "reins". Stark may "reign" at Stark Industries but he would take over the "reins" of the company.
Character mistake: The actor who played FBI agent Ross is Lennie James, who is an English actor. When they are searching for the girl in the parking garage of her building, he orders the SWAT team and other agents to search everywhere, under the cars and to "check the boots." He says this twice. Boot is the British term for trunk. He should be telling them to check the trunks of the cars, not the boots.
Character mistake: Joan Clarke pronounces the name of the mathematician Euler to rhyme with "ruler", when in fact it is pronounced "oiler."
Character mistake: The endotracheal tube (breathing tube) was not secured to the patient. It is standard practice to secure this tube to the patient in order to keep it in place.
Character mistake: In the scene where Maverick flies into Iceman's jetwash, as they are descending, Maverick calls out the altitude as 6,000 however the metre is displaying between 2,000 and 3,000. (01:04:25)
Character mistake: After Captain Willard walks through the front door of the burnt out French plantation dock there's a close-up of Chief Phillips at the wheel the boat. He turns around and looks right at Chef and says, "Lance". (01:56:40)
Character mistake: The definition of Satyagraha that Wilson, the butler at Harvard, gives is partially correct. Wilson defines it as "truth and fairness." A quick look at Wikipedia defines Satyagraha as "holding the truth." The definition from the online Merriam-Webster dictionary could be loosely described as "persistence of truth." (01:38:30)
Character mistake: When they're reviving Lindsey, Bud screams "fight" and slaps her. watch as she closes her eyes on the second slap while she is supposed to be dead.
Character mistake: In a scene set in 1965, Aaron taunts his bullies by telling them that none of them would ever earn "over $19,000 a year." In 1965, a salary of $19,000 p.a. was the 2025 equivalent of over $195,000 p.a. Not much of an insult, Aaron! Perhaps he meant $1,900?
Character mistake: Some of Colonel Jessup's ribbons are in the wrong order, and his Combat Action Ribbon is backwards.
Character mistake: When the Japanese attack is imminent, a soldier loads the 50 caliber machine gun rounds into the box backwards, with the rounds facing the gunner.
Character mistake: When the candidates are sworn in, after Foley is thanked, he salutes and does an about face. He then steps off on his right foot. No Marine NCO would do this.
Character mistake: When Jamie is first speaking to Aurelia, he says "molto bueno", which the housekeeper woman tells him is Spanish. 'Molto' is actually Italian. (00:38:30)