Samuel L. Jackson said on a talk show that throughout filming, he and his co-stars didn't know just how big Kong was supposed to be. Whenever they asked, they got conflicting answers.
Originally, the movie was over three hours long, however it was cut down to one hour and fifty-eight minutes in length. Elements of the movie's extended plot that didn't make it into the final cut can be found within the movie's novelization. They include James Conrad's (Tom Hiddleston) encounter with a giant snake, and an extended fight sequence between Marlow (Will Brittain) and Gunpei Ikari (Miyavi).
Brie Larson also doubles as one of the natives on Skull Island. She greets the survivors with a spear.
The scenes with mountains, rivers, and grassy fields were mostly shot in Vietnam, including Ninh Binh and Quang Binh. Jordan Vogt-Roberts and the cast members said they were the most beautiful places that they've ever been.
Nick Robinson, Moises Arias, Erin Moriarty: Brief background cameos during the bar scene are from the actors of Jordan Vogt-Roberts' The Kings of Summer (2013).