Corrected entry: When David calls Jennifer from a pay phone where he claims he's at NORAD in Colorado, he asks her to buy him a plane ticket from Grand Junction to Goose Bay, Oregon. NORAD is located near Colorado Springs, that has a main airport. Grand Junction is a five hour drive west through the Rocky Mountains.
Corrected entry: At the end, the suggestion to unplug W.O.P.R. to prevent the missiles from being launched was actually the right suggestion. Given that W.O.P.R. was guessing the launch code by brute force, the actual order to launch the missiles wouldn't be given until the launch code was determined and therefore the silos would not interpret anything until they received not only the order to launch but with the right launch code.
Corrected entry: There is a problem in this movie with time compression. They are racing against the clock to save the world, yet the two main actors manage to travel from Colorado to Oregon, play scenes with the scientist, and get back in what seems like a day or so.
Corrected entry: In the film, the DEFCON scale is treated with 1 being war-status and 5 being absolute peace. In real life, it's the other way round with 5 being war and 1 being absolute peace.
Corrected entry: At one point the General suggests unplugging the system so the missiles won't go off. McKittrick says the WOPR would interpret that as a shutdown and launch the missiles anyway. But if that were the case then why didn't WOPR launch the missiles when David shut down the game from his home earlier in the film?
Corrected entry: The very first time when David connects to NORAD from his room and Jennifer is in the room with him she is wearing very short, shorts, but after they flash to the NORAD scene during the first simulated attack and we go back to David's room, Jennifer is now wearing long sweat pants.
Corrected entry: McKittrick tells the General at one point that the missiles won't launch unless in DEFCON 1. However towards the end of the film, everyone in Norad is in a panic when seeing Joshua getting the code and about to launch the missiles itself. Why then wouldn't anyone in Norad just get out of DEFCON 1 and move to any other DEFCON number so Joshua could not launch the missiles even if finding the code? Nobody with NORAD intelligence thought of that?
Corrected entry: At the start a captain and lieutenant take up duty at the Launch Control Facility. Shortly after taking up duty an audio "Go to war" signal is received. Part of the signal is Tango, Tango, Lima, Alpha (T,T,L,A) in writing it down to confirm correctness the lieutenant writes down T,T,A,A.
Corrected entry: At the end after the "missiles" hit the air force bases and they find it was all a bluff, they cannot stand down the missiles because they are locked out of the WOPR. When the general tells McKittrick to "just unplug the damn thing", he says they cannot because the silos would interpret the shutdown as a destruction of NORAD and they would carry out their last commands which would be to launch. When they play Tic_tac_toe and tell Joshua to play himself, he hits the code to launch (not that this would work, since the code would not be found one digit at a time, either it's correct or not), then blows up a stack of circuits due to overload. Based on what Mckittrick said earlier, the silos would have launched the missiles.
Corrected entry: The whole point of playing tic-tac-toe in the end was so Joshua could learn that the game would always end a tie. But take a close look at the second game he plays in the war room. Two "X"s and two "O"s are played in boxes where all Joshua would have to do is put the next X in the top middle box, and he would've won that game. A human could conceivably miss that, but since it was just established that Joshua was playing himself (of players "zero"), a computer wouldn't have missed such an easy move, especially since the reason Joshua plays anything is "to win the game".
Corrected entry: As David and Jennifer sneak up the stairs to his room while his unaware dad is watching the news in the next room, listen carefully to the news anchor. The newsman says, "There has been an explosion in a prophylactic recycling plant." Obviously nobody recycles condoms, so this is probably an adlibbed joke by the fake news voice talent that stayed in the final cut.
Corrected entry: In the scene at NORAD when officials are trying to figure out what happened with the initial security breach, Paul says to McKittrick that the perpetrator broke in using a backdoor left in by the original programmer (i.e., Falken's password "Joshua"). That meeting also reveals that they took the backdoor out, but that the guy broke in again (note that David did not intentionally break in again - Joshua called David). The error comes when David is left alone in McKittrick's office in a later scene and proceeds to login using "Joshua." That password was gone by then (just as it is at the end when Falken tries to use it).
Corrected entry: At the beginning in the launch sequence, we see the officers enter the launch command sequence etc. into the computer. At the top of the display screen there is "WOPR Execution Order". The WOPR is the computer installed later to replace the missile launch personnel, and is a brand new device, so this screen display is a little too early.
Corrected entry: At the beginning, the missile silo launch officers are changing shifts. Both of the officers going off duty exit the control room before either of the two relieving officers enter, thus leaving the watch stations completely unmanned for ten seconds or more, not very likely for a strategic nuclear military facility. (00:02:20)
Corrected entry: Towards the end of the movie, when they are trying to get into NORAD, they crash their jeep into the fence and the jeep falls over. The next scene shows them running away from the jeep, and it's parked normally.