Corrected entry: When McClane enters Holly's office, a crew member is reflected in the mirror. (00:12:05)
Corrected entry: When the FBI agent is telling the worker from the power company to shut of the power, the worker says that the power will be out for several city blocks. When the helicopter is taking the agents to the Nakatomi building, all of the lights are on in all of the surrounding buildings.
Corrected entry: Any glass in modern office buildings is tempered glass. This kind of glass breaks into tiny, rounded pieces with semi-smooth edges. If you were careful you could easily walk on it without injury. John should not have had splinters of glass in his feet.
Corrected entry: Willis loads a clip into the grip and then pulls the slide back to supposedly chamber a round before handing the weapon to Rickman. The problem: When you pull the slide back on the Beretta when the clip is empty, the slide locks in the open position unless another switch is tripped. Willis did not do so and Rickman's character, a sophisticated terrorist, would clearly have realised the weapon was not loaded. (01:30:15)
Corrected entry: In the begining of the film when John is in the limo, there's a teddy bear next to him in the back seat that has a red bow around his neck, however, in next scene, the bow is gone, and the next it magically appears.
Corrected entry: At one point McClane interrupts Hans on the walkie talkie while Hans has his transmit key down and Hans can hear what McClane is saying. You cannot hear anyone on a walkie talkie while your transmit key is pressed.
Corrected entry: After killing the first terrorist, John tries on his shoes and finds that they are too small. Why after killing the others does he not try on their shoes as well?
Corrected entry: There is a scene where Bruce Willis and Alan Rickman meet. Rickman poses as an American employee of Nakatomi who escaped the terrorist siege of the building. Willis hands Rickman a Model 92F Beretta 9mm handgun implying that Rickman might help Willis fight the terrorists. Rickman then turns it on Willis. The problem: The 92F Beretta is the civilian/police model of the current U.S. military and NATO sidearm -- the M9 Beretta. There is a bright red visible indicator on the right side of the slide that reveals whether the weapon is loaded or not. Any European terrorist of Rickman's sort would be well familiar with that fact and would not have been fooled into thinking the weapon was loaded when it was not.
Corrected entry: McClane uses the festive holiday tape that was used to wrap gifts to tape his pistol to his upper back before the big finale. Considering how much blood, grime and sweat McClane had on him, that tape would never have stuck to his skin, especially considering that it is only wrapping tape, not some kind of industrial tape like duct tape or anything stronger.
Corrected entry: The whole premise of the movie is to rob a very large vault of securities in the form of bearer bonds. The vault rightly takes hours to breach and the last safety feature requires a cut in power. This is patently impossible to accomplish in the short time they had. Firstly, that super-sophisticated vault would have a state-of-art power back-up system that would take hours itself to be disabled. It is likely that the disabling of THAT system would lock down the vault and seal it for days or weeks. Secondly, shutting down the main power would almost certainly lock down the vault. I actually install the back-up systems and know that any odd power surges or especially power losses alert the security systems to prepare a lock down.
Corrected entry: When the terrorist breaks into the candy rack, he reaches his hand into a box marked Nestle and later he is eating a Hershey bar. Then in the next shot he is eating a different type of candy bar.
Corrected entry: When John is on the roof trying to radio for help he connects with a woman from an emergency help line, why does the woman not believe him when he tells her about the huge emergency? Not in a million years would a person from the emergency help line not believe you when you call them with an emergency, even if it sounded like a child making a prank call ordering a fire-truck to his friend's house and they could hear the child giggling while he's saying it, they would still have to send someone out. John is screaming at the woman for help and she still doesn't believe him.
Corrected entry: Hans and most of his men arrive on the 30th floor party and begin firing. Upon hearing the shots, McClane grabs his gun and is able to sneak into the nearest stairwell and climb up a few flights of stairs (he checks and passes the 31st floor, where a few more of Hans' men are spotted wheeling supplies) before finally arriving at the 32nd floor to begin seeking help. For essentially the remainder of the movie, McClane remains "above the danger zone", so to speak. However, it is fair to theorize that when McClane initially reached the stairwell undetected, he could have also descended to any number of other floors to then seek help. Even if many of the lower floors may not have been open (locked, not finished, etc.), McClane could have simply descended as far down as the main lobby (and out the front doors). Remember, Hans and his men were not aware of a straggler at first, and in theory all McClane would have had to do is descend the stairs to the main floor and get past the lone terrorist acting as the "security guard" at the desk.
Corrected entry: German does not seem to be any of the terrorists mother tongue - they all have a terrible accent and sometimes what they are saying does not make any sense. E.g. when the terrorists hunt Bruce Willis on the roof and he escapes into the elevator shaft, one of the terrorists uses his CB-radio and says something like: "Wir sind im Heizenhaus, unter dem Dach". The word Heizenhaus does not exist. If you change it into "Heizhaus" it would translate into "boiler room" - a room that is not normally located right under the roof, is it?
Corrected entry: The C-4 explosive would need an electrical charge to cause the explosion. The chair and computer monitor or fall wouldn't cause the C-4 to detonate.
Corrected entry: When Bruce Willis is fighting the first terrorist, they both crash into a stairwell door and the door breaks off it's hinges and falls on the stairs. The floor was under construction but the door is obviously attached. I find it hard to believe that two people crashing into a office building door of that type would be enough force to break it off the hinges.
Corrected entry: McClane sends the elevator down to the 30th floor with Tony's body in it and gets on top of the elevator. The terrorists are there, standing about, discussing the body and that they must now tell Karl that his brother is dead. Why would they then press the button for the 32nd floor (the top floor) without getting in? That happens only so that Bruce Willis can get to the roof for the next scene.
Corrected entry: At the end of the movie, Richard Thornberg is trying to interview John and Holly. Holly socks him in his nose and he is grabbing it in pain. The next shot, as John and Holly enter the limo, he is talking to a camera normally as if nothing happened, then the next shot, he is suddenly holding his nose again.