Other mistake: When Godzilla emerges from the sea towards the end of the movie, what is he standing on? You can see the submarine at the side of him so the water must be reasonably deep. Then he just swims away. (01:37:15)
Other mistake: Dr. Serizawa and Dr. Graham say 17 MUTOs (and counting) have been identified, but they show at least 18 (Russia, Germany, Sudan, Egypt, Morocco, Scotland, Japan, China, Cambodia, Australia, Skull Island, Bermuda, Brazil, Peru, Wyoming, Arizona, Stone Mountain [Georgia], and Isla de Mara) as Dr. Mark Russell thumbs through the map screens on the tablet. This doesn't include "Monster Zero" in Antarctica (making it 19, but they claim it was kept off the books on purpose a little later in the movie.) If they have at least 18 confirmed on the map, why not say 18 and counting, especially since they run Monarch, you'd think they'd know the accurate "updated" count as more MUTOs are found.
Suggested correction: Dr. Serizawa actually says "17 and counting 'after Godzilla'" which means that including Godzilla, there are 18 titans.