When asked about the apparent height difference between Godzilla and Kong in 2018, Adam Wingard said "They gave us a good out in Kong: Skull Island (2017) when they mentioned that Kong is still growing, but that'll be a challenge we have to deal with, and we're very aware of that issue."

Jia is a deaf Iwi girl portrayed by Kaylee Hottle, who is from an all-deaf family. The auditions for the character came down to a handful of deaf actresses, with Hottle impressing director Adam Wingard the most, making it clear she was a professional. He tried making her laugh at one point by attempting Michael Jackson's Moonwalk, "and she was just completely deadpan." He learned then to let her do her thing and "just stay out of her way". Wingard took three months of sign language lessons but was incapable of grasping it. He ended up using an interpreter alongside Hottle so as to avoid embarrassing himself.

The film takes place five years after Godzilla: King of the Monsters (2019), and 51 years after Kong: Skull Island (2017), which took place in 1973.

Adam Wingard explained why the movie's runtime is a little less than two hours. He stated that this is on purpose, telling Variety that he prefers to keep his films under the two-hour mark. The director also said that if Godzilla vs Kong were to run for three hours, it likely wouldn't include an additional hour of the Titans duking it out. He stated; "A lot of the fans online were all asking me is this going to be a three-hour film? When it was announced that it was a little under two hours they immediately thought when is the director's cut coming out? I like movies under two hours. I think if you do a movie over two hours, you better have a damn good reason for it to be that long. At the end of the day, if you're going to make this movie into three hours, you're not going to get an extra hour of monsters fighting. You're going to get an extra hour of people talking about monsters."

Earned over $122 million during its opening weekend sales, the biggest opening of a movie released during the pandemic.

Continuity

Lind sees the HEAVs for the first time just before the teams embark on them. In an hour he's suddenly able to pilot a HEAV and even let it explode on purpose.

A big part of the film centers on the existence of the 'Hollow Earth' and how humanity has been unable to (and died trying to) reach it. The HEAVs are built specifically to withstand the harrowing journey. After getting there Godzilla simply blasts a hole through to it from where it is standing creating an easy and direct link to the center of the Hollow Earth.

When Kong arrives in Antarctica, the net he was carried in is noticeably smaller on the ground than it was in the air.

Madison's ear rings disappear and reappear multiple times throughout the film, especially when talking to the shopkeeper during her search for Bernie.

The film is presumed to take place five years after Godzilla: King of the Monsters (2019) (Simmons states in this film that Godzilla's battle with the MUTOs was ten years ago, and King of the Monsters explicitly took place five years after the MUTO incident which it said took place in 2014); the novelization explicitly claims to take place three years after King of the Monsters, but it has self-contradictory chronological dating. It explicitly says that the MUTO incident still occurred in the year 2014 and the events of King of the Monsters in the year 2019, which should place the novel's chronological year at 2022 in relation to the three-year gap; but the novel still says more than once that "ten years" have passed since the 2014 crisis instead of amending it to "eight years" or amending the MUTO crisis' date to 2012.



Factual errors

The opening credits give us numbers for Godzilla: he's 393 feet tall and weighs 164,000 tons. A Nimitz-class carrier weighs at most 117,000 tons. Godzilla alone outweighs the carrier. The carrier should have immediately capsized the moment Godzilla tried to climb on to fight Kong.

Kong's weight which is estimated to be similar to Godzilla's, that being 164,000 Tons, there is no way all of the helicopters of the world could airlift that kind of mass it would be physically impossible, and even at that, logistically impossible to comprise a formation of such a feat.

Hollow Earth would be by the Earth's core, thousands of miles deep. They enter from a portal in Antarctica. And yet, Godzilla later in the movie burns a random hole in the ground in HK deep enough to reach it, roars through it and Kong hears it, and he easily climbs it to poke back to the surface.

When outside in Antarctica, along the coast a warm day would be about 14 degrees, but there is never the frosty breath of Kong or any characters.

On closer inspection, the warships with the battleship styled turrets have the distinct superstructure of the Arleigh Burke class guided missile destroyer, while the hull heavily resembles the far more older Iowa class battleship, all of which were decommissioned throughout the 1990's.



Revealing mistakes

When Kong grabs Godzilla from behind, the spikes on Godzilla bend as if they were made of rubber. They should be bony plates that are rigid.

When Kong shoves his ax's handle into Godzilla's mouth and Godzilla's spine bends backward, the plates on his back shrink and get thinner as his CGI model contorts. Then as Godzilla bends forward, the plates expand and become much larger. Evidently, Godzilla's 3D model was not designed with these kinds of extreme movements in mind, so the size and shape of his plates keep changing in relation to his body position.

(At 1 hour, 21 mins) Bernie Hayes pulls out his phone to take pictures, a camera shutter noise is heard repeatedly and he says "Yeah, going viral". But he has a flip phone with no camera.

During Kong's fight with Godzilla in Hong Kong, right after Kong releases his grip around on Godzilla's neck and the two monsters swing around, Kong's left hand clips completely through a building on the left side of the screen, without damaging it in any way.

When Kong jumps on Godzilla from the back and slams him against a tower in Hong Kong, Godzilla's entire neck and head get flattened for a moment, his head becomes rubbery with his snout bending away from his head like a "squash and stretch" cartoon character.



Miscellaneous

After the ocean battle near Antarctica, no one considers searching and/or rescuing survivors from the destroyed ships, though dozens of them can clearly be seen tossed into the water.



Character error

MONARCH crew is monitoring Godzilla and as soon as he changes his course, they calculate he's heading towards Hong Kong and follow suit. Nobody tries to warn the city and the evacuation begins only after Godzilla emerges there.

After the ocean battle near Antarctica, everyone is soaking wet, yet no one seems at all cold.

Maia makes the common mistake of referring to Kong as a monkey instead of an ape. She does so multiple times despite there being many people with her who would know better.