Character mistake: Carl, carrying his gun, goes up the outside staircase before entering Frank's apartment. When he encounters the frightened cleaning woman, he flashes his F.B.I. badge at her to identify himself. However, he only shows her the back of the black I.D. wallet, which has no markings on it.
Character mistake: Julie Madison, when having dinner with Bruce Wayne, says that he just called her Ivy. He didn't, and never does in that scene.
Character mistake: A radio report refers to a character with two different police ranks with 15 seconds apart in the same broadcast - first as a Police Chief and a few seconds later as a Captain. (00:21:28)
Character mistake: The mother is supposed to be American, but she speaks in her native Australian accent near the end when she says, "I don't think I can take anymore of this" upon finding out that Pita may be alive.
Character mistake: Poirot identifies Prof. Hardman's revolver as a 1927 police-issue weapon due to its blued finish and chequered grips. In fact, these features were common in the widely-available civilian versions of the Colt 'Police Positive' revolver and not the least bit specific to police-issue weapons.
Character mistake: The letter from the FBI containing the results of the blood and semen test is filled with numerous typos. First, on the line "Subject: Result of examination requested", the word "examination" is misspelled "examnation." Second, the term "DNA instrumental analyses" has "instrumental" incorrectly spelled as "insrumental." Third, the line "Reference: Letter dated October 21, 1987", has the word "dated" misspelled as "dateed" and the month "October" misspelled as "Octorber." (01:58:35)
Character mistake: Right at the beginning of the movie, introductory technobabble. "In this canister, there's a solution of protons. The canister is attached to a rotor circuit that generates the protons to the speed of light." I believe the science genius and creator of time travel mixed up the words "generate" and "accelerate" here. (00:00:50)
Character mistake: When the neighbor is showing off his Challenger he states it is a 1972 4.9 liter. Dodge never made a 4.9L that year, only a 3.7L, 5.2L and 5.6L.
Character mistake: In the final scene of the film where Axel is leaving, and Taggart says "See you around." when Axel turns around to start driving he says "Be cool Rein..." He accidentally uses the surname of the actor, Judge Reinhold, who plays Billy Rosewood. However he cleverly tries to cover it up by trailing off his sentence as he knows he has made the mistake. (01:34:15)
Suggested correction: He doesn't say "Rein", he says "be cool, man." But that was the end of his sentence, he wasn't trailing off.
Character mistake: Reacher asks the MP Sgt who her "DI" was in "boot camp." The Army doesn't have Drill Instructors or boot camp but rather "Drill Sergeants and Basic Training." Call a drill sergeant a DI and you'll be doing push-ups, seen it happen.
Character mistake: When the undercover cop says, "Hi, when was the last time you had a good..." she doesn't identify herself as a police officer. (00:37:15)
Character mistake: Wouldn't the president be concerned that the alarm system, which Luther deactivated, was deactivated?
Suggested correction: How would he have known that it was deactivated? It wasn't even his mansion. He was drunk after all and focused on the girl.
Character mistake: During the St. Ives riddle, Simon gives them 30 seconds to solve the riddle and call back. But it takes them 65 seconds to call, to which Simon says they're 10 seconds too late. And, after 42 seconds, McClane says they only have 10 seconds left.
Character mistake: When Francis Allen is being interviewed by Reagan, Allen presents Reagan cell phone pictures of himself on a yacht to support his alibi. Allen says "the time and date are on the top of the screen, you saw that, didn't you Reagan?" and Reagan agrees. However the date is seen at the bottom of the screen, not the top.
Character mistake: When we see the relative positions Eddie and Johnny have, Eddie appears to be the one that should have done the signaling to the patrol car instead. (00:55:40)
Character mistake: Casey is sixth of six male students standing in a row to individually demonstrate a karate move for Sensei. After the fourth student, Sensei passes up student #5 and says, "Next. Casey." Sensei completely missed the fifth student, the only other beginning white belt like Casey. (00:28:45 - 00:29:10)
Character mistake: Why would the rich witness be at the supermarket himself and using a taxi cab?
Character mistake: Just after the shootout between the robbers and the armored truck drivers at the dip in the road, the teacher that is with the robbers pumps the shotgun about 3 times, without firing a shot after they crossed the water. This would just waste a perfectly good cartridge, since they hadn't been shot yet.
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: At the meeting in Washington the general says nothing more frightening than a soldier with his M16A1, but they were using M16A2s.