Originally, Dr. Serizawa was to introduce the titular monster as "Godzilla", but Ken Watanabe asked the filmmakers to use the original Japanese name of "Gojira".
Godzilla is covered in keloid scars (raised, thick patches of skin). The original Godzilla (1954) was heavily scarred to evoke the gruesome marks borne by the survivors of the Hiroshima and Nagasaki bombings.
The sound designers used a twelve-foot high, eighteen-foot wide speaker array to blast Godzilla's roar at one hundred thousand watts, to get a good idea of his vocal power and strength.
Dr. Ishiro Serizawa was named after Ishirô Honda, director of Godzilla (1954), and Dr. Daisuke Serizawa, one of its main characters.
The United States Marine Corps declined to participate after their experience on the 1998 TriStar film. The United States Navy cooperated with the 2014 production.
Akira Takarada: An immigration officer. Takarada starred in the original Godzilla (1954) and appeared in numerous sequels. His scene was cut from the theatrical release, but appears on the DVD. This also was Takarada's final appearance in a Godzilla film. Sadly, he would pass away in March 2022.