Hawaii Five-0/Trivia
- Defictionalization: A throwaway reference to "Kukui High School" in the pilot has led to fans creating a whole backstory for an otherwise fictional school, complete with logo wear. In Hawaii, high schools are a big deal.
- Fake American
- Alex O'Loughlin. When in character as Steve McGarrett, he sounds just like an American; when out of character (such as when being interviewed or doing promotional appearances) his Australian accent is unmistakable. Yet again, Steve's American accent is almost too pretty to be real.
- Also, Korean-Canadian Grace Park as Kono. But do know that Grace also has American citizenship, since the Canadian government does allow dual citizenship. So it may not be totally true.
- Tony Curran as a Boston-born Irish mob hitman in "Ike Maka".
- Fake Brit: Australian actress Clare van der Boom as Danny's British-born ex-wife Rachel.
- Hey, It's That Guy!
- The Hesse brothers, a.k.a. Spike/John Hart and Murphy MacManus.
- McGarrett Senior, played by perennial H!ITG William Sadler (the father from The Green Mile, Sheriff Valenti from Roswell).
- Not to mention Mick St. John, Turk, Jin-Soo Kwon and Boomer/Athena have all become Hawaii state cops.
- Hiro Nakamura is also a coroner.
- Martha Logan went from First Lady to Governor of Hawaii.
- Cherry is McGarret's sister.
- Hercules is a Corrupt Corporate Executive.
- Detective Chester Lake as a rogue Navy SEAL.
- Lady Deathstrike as the Governor's new public safety aide.
- Bayliss tragically loses a daughter to murder. Again.
- Flack's girlfriend is now an assassin.
- Tony's wife is now Chin's ex-fiancee.
- Holy...Goliath/Foley is a gangster who put a hit on a federal agent?!
- Bianca Stratford/Alex Mack is a CIA agent on leave investigating Wo Fat.
- Speaking of Wo Fat...
- Grace Barry is Danno's ex-wife.
- John Locke is Steve's mentor.
- Haley Hotchner is the fugitive wife of a dead embezzler.
- Jimmy Buffett is the helicopter pilot, which is a Shout-Out to one of his hobbies.
- The art dealer in "Mana'o" is played by Bronson Pinchot, who previously played Balki Bartokomous in Perfect Strangers. And played art dealer/weapons dealer "Serge" in the Beverly Hills Cop series of movies.
- Branscombe Richmond, who plays the pirate Saloni in the episode "Powa Maka Moana," well known as Bobby Sixkiller from Renegade.
- One of the Irish mobsters, John O'Toole in "Ike Maka" was Vincent van Gogh in Doctor Who.
- Phillies outfielder Shane Victorino and Olympic gold medalist Apolo Ohno both show up in "Kupale", the latter as a suspect.
- Vicki was Hilary Chaver, the hitwoman in "Ua Hala", the second-season finale.
- And Adam Noshimuri was also once Simon Lee.
- Playing Against Type: Coach Tanaka as a Filipino terrorist.
- Real Life Relative: James Caan (father of Scott) guest starred in "Lekio" as a former cop/murder suspect.
- What Could Have Been: Reportedly James McArthur (the original show's Danny) was set to play Danny's father in the remake when he unexpectedly died.