Factual error: The Apaches in the film are depicted with dual machine guns on each side of the cockpit, mounted directly on the windows. In real life, Apaches cannot mount such cannons, and instead use an M230 Chaingun in a turret underneath the helicopter, which the film Apaches have, but for some reason do not use. (00:49:25)
Suggested correction: Yes, we can all see they are supposed to be Apaches but not once are they mentioned by name. The US Army obviously didn't allow for real Apaches to be used. This isn't a mistake as there would have been no official licence to use the real deal.
Other mistake: When they are tracking Godzilla to the second pile of fish in Central Park, the tracking device says that Godzilla is moving with a speed of 175 mph. If you look at the shots before it with the soldier looking over the top of the building, it is impossible for her to walk at that speed. (01:18:15)
Suggested correction: She was moving at 175 meters per hour, not miles.
That would be an even more ridiculous speed. First, "mph" in America is the standard abbreviation for "miles per hour." Second, 175 meters per hour is less than 2 inches per second, which is slower than a slug.
Factual error: A sergeant is neither called sir nor is saluted. Sergeant O'Neal is called sir twice and saluted twice. The first time is shortly before they dump the fish for bait the first time. Someone runs up to O'Neal, says sir and salutes him. He says something about ten minutes then salutes him again and runs away. The second time is when O'Neal is on the roof and looks over the parapet and sees Zilla walking past. Right after that someone comes up to him and says "Sir, Godzilla has been spotted in section five."
Suggested correction: Sergeants, just like any other military member of a higher rank than the person doing the saluting, are called sir as well as saluted.
Not true. Sergeants are non-commissioned officers. They are respected for experience and expertise but they are not saluted first or called Sir. (Some services will have Drill Sergeants or Platoon Sergeants addressed as Sir by recruits in basic training but that's not happening here).
Factual error: F-18 Hornets deploy Harpoon anti-ship missiles to destroy Madison Square Garden. The Harpoon is an anti-ship missile, designed to punch holes in ships. It is not designed, nor capable of levelling buildings. A Harpoon also works best over water; firing over a crowded city confuses its radar seeker head and leads to tracking issues.
Suggested correction: There is a variant of the AGM-84 Harpoon called the "SLAM" (Standoff Land Attack Missile) which is a harpoon variant used for surface targets. Its designation is the AGM-84E. Also it's guidance system is an active radar homing system which is perfect for pretty much any targeting, not just over water. It is used on Phoenix AA missiles, Hellfire Air-To-Surface missiles and the very famous Patriot SAM missiles. Plus the SLAM even uses GPS.
Revealing mistake: When Godzilla attacks the fish market, the creature picks up the seafood/fish truck with the driver still inside. As he's being knocked out of the cab, you can see dozens of boxes set up where the truck was once parked for him to land on. (00:26:00)
Suggested correction: Boxes are actually beside the truck before it is lifted off the ground.
There are crates next to the truck, not nicely stacked boxes.
