Jason Antoon and Seana Kofoed, who play Ernie and Medical Examiner Chase, respectively, are husband and wife off-screen.
May 2, 2021, CBS announced the official name of the series would be NCIS: Hawai'i (with the okina or glottal stop between the two I's), reflecting the state's name in the Hawaiian language and the official name for the Big Island of Hawai'i.
This show uses the same Honolulu PD vehicles as Hawaii Five-0.
Enver Gjokaj [Navy Captain Joe Milius] appeared as the character, Marku, in Hawaii Five-0, which is part of the same 'TV Universe' as NCIS.
This is the first show in the NCIS series that doesn't have a 'back-door' episode connecting it to either of its predecessors.