Casey Ryback refers to Nash as "E1 Prick", and also Commander Krill calls him "Private". However, Nash is clearly a PFC, or Private First Class. An E2. Neither a Navy Chief nor a Navy Commander would ever call a Marine Corps PFC a Private.
During the shootout that takes place while Ryback and his companions are freeing the drowning sailors, a terrorist with a thick brown mustache is killed 3 different times. He is the terrorist that is shot and does a backward roll down the stairs.
The clothing worn by Strannix changes three different times within 5-6 minutes of the film. At the party area when the mercenaries begin their assault, he is wearing sunglasses, a blue and pink shirt and a jacket. In his next scene when he delivers his "We will shoot you and the man next to you" speech, he is wearing a dark sweater with no shirt, jacket or sunglasses. In the next scene when he enters the Captain's quarters he is back wearing his shirt, jacket and sunglasses. His clothing changes again when he is in the control room and yells "get something to eat in here", when we next see him cutting up meat he is back wearing just his dark sweater.
When Cates and Ziggs release Ryback from the meat locker, they slide the sharpening steel the door is jammed with away behind them, several yards from the door. But when Ryback leaves the meat locker and locks the terrorists in, he picks up the steel from right next to the door.
At the end of the film as Ryback is on the phone with the command center and then sending the self destruct code to the Tomahawk missile, the time on his wristwatch jumps back and forth between 7:45 and around 7:58 several times.
Early in the movie, Strannix refers to the submarine with the alias "Tweety Bird" and US military forces with "Wile E. Coyote". However, later in the film, "Wile E. Coyote" is used as an alias for the submarine instead.
After Ryback breaks out of the meat locker, he kills Ziggs. Afterward, he lures Cates by whispering his name. As Ryback had spent the last few hours locked in the meet locker, he had no way of knowing any of the terrorist names.
In the opening sequence, when sailors below-deck are talking about wearing dress whites, they are wearing the traditional white jumper with neckerchief, which is one version of dress white uniform. However, when we see the ship coming into harbor and during the resident's speech, all of the sailors on deck are wearing "summer" whites, in which a short-sleeved white shirt is worn in place of the jumper.
When the private informs Ryback there is a fire, Ryback tells him to "take my pies out of the oven." The private is then shown lifting pies out of the oven, but the burners are those of a propane stove. The U.S. Navy does not use propane/natural gas ovens, to carry that gas on a ship in war would be deadly. All cooking in the galley is done on electric appliances.
A Harpoon missile is launched from the Missouri to destroy a satellite relay station on a nearby island. The Harpoon is an anti-ship missile and is not designed to destroy land targets. Its warhead is designed to track and destroy naval surface targets by radar. The TV image of the building being destroyed would have been from an air-launched Maverick AGM. A surface ship would most likely use a conventional Tomahawk cruise missile to destroy a fixed land target.
At many points through the film, Casey's rank is referred to by different titles. He holds the rank of Chief Petty Officer. Early in the film, Ensign Taylor refers to him as "Petty Officer", something an officer would never do, even as a sign of disrespect. Commander Krill refers to him as "Mr. Ryback", a title usually reserved for junior officers. Many junior sailors refer to him by his first name, which is highly unusual for a SEAL (of course, no one except the captain knew he was a SEAL, so that's understandable). Most everyone should call him "Chief".
When Ryback is preparing to blow up the helicopter on the deck he grabs a name-brand can of paint thinner. Firstly flammables such as this would not just be lying around on a flight deck area. Secondly any substance like this would have come from the Navy supply system and would have a very generic-looking label.
When Casey Ryback is unscrewing the fuse from the shell in the kitchen so that he can use the explosive to make the bomb he attaches to the submarine, the shell is around 10" caliber. The Missouri has 16" turret guns and 5" mounts, nothing between. The shell Ryback uses should not be on the Missouri.
Mr. Pitt makes a comment about the SEAL strike team who "think they can fly in under our radar" which is actually an accurate statement; however, the SEAL team on-board the approaching helicopter is flying at about 300 feet ASL (above sea level), which is unconscionable given that the stealth approach to flying under a ship's radar is about 40 feet above sea level, but never above 100 feet or so above sea level in order to avoid radar detection. Thus, had the SEAL team flown at the proper very low altitude, there would have been an excellent chance that they could have been inserted very near the Missouri without being detected.
CDR Krill states that Ryback had earned a Purple Heart with a Cluster. The Department of the Navy does not award multiples of a the same decoration with Oak Leaf Clusters as the Army and Air Force do. Instead, multiple awards are indicated by Service Stars.
The events in the film were said to be happening during mid to late December, 1991. At one point in the film, Admiral Greer calls on the U.S.S. Nimitz task force to respond to the threat, which it does. In August of 1991, the Nimitz had just returned to her base in Bremerton Washington, from a tour in the Persian Gulf. From October of 1991 to May of 1992, she was on what is known as "selected restricted availability (SRA)", meaning that she was undergoing maintenance, upgrades, repairs, etc. during that time, and was probably not in a position to render assistance to Pearl Harbor. Not to mention that Pearl Harbor has it's own naval and air bases that would be more than capable of dealing with the threat of a rouge battleship with nuclear missile capability, and were probably closer to striking distance of the U.S.S. Missouri than anything on board the Nimitz could be.
The opening voice-over states that the USS Missouri was "Built to avenge Pearl Harbor." This is not strictly accurate, as the Missouri was already under construction at the time. She was ordered in 1940 and laid down in January 1941. Although the US did complete the eight battleships under construction at the time of the Japanese attack, no further battleships were ever ordered, as it was plain that such ships had had their day.
During the opening news commentary the commentator talks about supposed nuclear weapons on board the Missouri as the reason the ship is leaving port. It is the policy of the U.S. government, and so the U.S. Navy, not to reveal or discuss the presence of nuclear weapons on any station or vessel.
At one point the terrorists use one of the ship's CIWS mounts to destroy an F/A-18 aircraft which is flying alongside the ship to investigate its silence. However, the CIWS system is entirely automatic and programmed only to engage approaching threats. It would not fire at anything flying parallel to the ship.
Chief Ryback is stated to have only been able to become a Yeoman or a cook (Mess Managment Specialist) after losing his clearance and standing as a SEAL. A Yeoman requires a secret clearance, so he would not be able to take this rating.
Chief Warrant Officer Flicker wears rank insignia on both collars. Warrant Officers only wear a rank device on the right side. They wear their former enlisted specialty rating device on the left collar.
Ryback calls Pvt. Nash an "E1 prick," yet the rank on Nash's collar (a single chevron) indicates that he is a Private First Class (which has the rank of E2). However, it is very likely the Ryback knows nothing about Nash (as Nash only recently came on board the ship and knows nothing about Ryback), did not notice Nash's chevron on his collar (which is black on camouflage) in the galley as Nash was in the background the whole time, and is simply presuming Nash's grade based on Krill addressing him as "Private Nash" (which is an E1 rank). Thus, the error is not on Ryback, but rather Krill who, as a senior naval officer working with sailors and marines, should know proper protocol and referred to him as either "Nash" or, more formally, as "Private First Class Nash."
Tom Breaker sites Executive Order 136 as the policy authorizing the CIA to "neutralize" Strannix; however, Executive Order 136 (issued by Taft) deals with rewording a section of EO 128 so that "light-ship" becomes "light-house tenders and light vessels".
The assault team is in a CH 46 Sea Knight helicopter, not a CH 53 as stated. The Navy doesn't use attack helicopters, let alone the AH 64 Apache as this is used only by the US Army. The Marine Corps which is a part of the Navy would be using AH 1W Cobra attack helicopter but not in the role shown on this movie.
Ryback sets the grenade to drop and detonate when the hatch is opened. This means the latches would be undone on one side of the hatch. When the grenade detonated, the door should have been blown open but still be attached to the bulkhead by the hinges. It would not have been blown across the deck.
Ryback introduces an MP5 to Jordan as an 'Assault Rifle'. The MP5 is actually a submachine gun. Also, he refers to it as an MP5 when it is in fact an MP5K [Kurz, meaning short in German]. When he gives Miss July '89 a gun, he refers to it as an MP5K even though that one is just an MP5.
The "real" USS Missouri has a circular commemorative floor plaque marking the site of the Japanese surrender that ended World War II. Nowhere is this plaque seen, thereby giving away the fact that the USS Alabama is standing in for the Missouri.
When the terrorists and Miss July are walking past the CH-46 helicopter, the rotors are shown rotating in the same direction. While CH-46 rotors do counter-rotate when operating, the engines were shut down at the time. Therefore, there was no power to the rotors. The rotors were simply "windmilling", that is, rotating with the wind.
When the CIWS gun shoots down the F/A-18, the ammo belt appears not to move. This is because on the Phalanx CIWS 20mm weapons system, the ammunition is fed from the ammo tank to the chamber in a closed shroud system, essentially a tube for the ammo to pass through.
The XO orders the Nuclear Weapons Officer to suspend security patrols while nuclear weapons were onboard. COMNAVSURFPAC regulations in force at the time of the movie did not permit this. Regardless of the XO's wishes the Nuclear Weapons Officer would have been required to raise the issue with the captain immediately.
When Strannix learns the identity of the cook he has to deal with, he appears to be ignorant of who he is and his abilities, and continues this throughout the movie. But in the final battle in CIC, Ryback recognizes him, and Strannix admits to knowing Ryback.
Cates and Ziggs enter the meat locker with their guns blazing in an effort to kill Ryback. After a few moments, Ziggs stays back and reloads, while Cates continues walking towards the back of the freezer. A careful eye will show that he only has about 5 feet of space in front of him, and it's obvious that there's no one standing there for him to shoot, yet he continues spraying gunfire in all directions without reason.
During the shootout scene where Ryback is locked in the freezer, the two terrorists are supposedly carrying suppressed (silenced) HK MP5ks . However, when fired they are not properly suppressed leading one to believe that the "Silencers" were not functional, or the sound was added later in post.
Ryback blows up the helicopter on the fantail of the ship and then jumps off the stern to escape the explosion. When the mercenaries show up looking for him among the burning wreckage, several white propane cylinders with hoses attached to them can be seen fueling the fires. In fact, two of the cylinders can be seen wiggling around in the wreckage on the right hand side of the screen.
The goof items below may give away important plot points.
During 1980's and 1990's deployment, the Missouri's (Iowa Class Battleship) 16" guns were fitted with the HE-CVT Mark 143 - 1,900-lb. (862 kg) shells which have an effective range of over twenty miles (34,000 yards). When Casey ordered the barrel to be elevated to 041 degrees and 042 degrees, that would put the projectile at detonation somewhere near it's maximum range, some twenty miles away, yet Krill and the sub which held the stolen Tomahawks was barely 3,000 yards away, far too close for the 16" guns to hit, which, if it were possible, the guns would have had to have been negatively elevated (below zero degrees) to hit a target at such close range, seeing as how they did not have anything other than starbursts (large flares) for the five-inch guns.
Krill says the reason he did not know Ryback's past as a SEAL before the operation was because he did not have access to the Captain's cabinet where his file was kept. However, with Krill's rank (And security clearance(s) that came with it), he should have been able to request a copy of Ryback's if he could not locate it in personnel. Furthermore, the fact that Ryback's file was missing should have been a warning sign to Krill that he needed to investigate it (To be fair, it is likely that this is meant to show the contempt that Krill had for Ryback in thinking that he was nothing special or worth looking into. That or how little he paid attention to detail on his part of the job).