This is the second attempt to remake "Hawaii Five-O" (1968). The first had been the sequel Hawaii Five-O (1997), which featured Grace Park's Romeo Must Die (2000) costar Russell Wong.
The car the group is seen driving around in is a 2010/2011 Camaro LT with a V6 engine, the RS performance package, and police lights added to the front end.
When CBS announced this series for the fall of 2010, they released the opening credits from the pilot online. They featured an electric guitar version of the classic theme, and it was met with mixed results. Producers revealed they hadn't decided whether or not to use it on a permanent basis, so they decided to stay with the classic. They brought in a full orchestra to re-record it, and three of the members had even played on the original. The electric guitar rendition of the Hawaii Five-O theme song was later used on promotional advertisements.
Grace Park plays Kono, a role originally played by Zulu. This marks the second time Park has starred in a re-imagined television series playing a role originated by a man, the first being Boomer from the rebooted "Battlestar Galactica" (2004) series, a role played in the original by Herbert Jefferson, Jr.
In the original series, Five-0's offices were purported to be on the second floor of the I'olani Palace, which in the late 60's to early 70's was in fact a state office building, but has since been restored as a royal residence museum. Five-0's offices for this series are depicted as being in Alii'olani Hale (right across the street), a state office building of similar architecture built in the 1870's which actually houses Hawaii's Supreme Court.
Michael Shanks auditioned for the role of Danno Williams.
The series premiered on September 20, 2010, exactly 42 years to the day from the premiere of the original series.
The Five-O name comes from Steve's father. When he and his sister were kids, Steve's father used to call them Five-Oers, because Hawaii is the 50th U.S. state.
Danny's favorite team is the New York Jets and when he moved to Hawaii he adopted the University of Hawaii's football team as his favorite college team due to the similar color scheme to the Jets' uniforms.
Al Harrington, who played Detective Ben Kokua on the original series, has a recurring role as Mamo Kahike.
Chin Ho was originally dismissed from the Honolulu Police Department after being falsely accused of taking bribes. Steve chose him for the task force because he didn't believe the accusations, and because Chin Ho was his father's former partner. It is later revealed in the latter half of Season 1 that Chin's uncle was the one who was involved (to pay off medical bills where Chin became a fall guy who took the blame where he was protecting his extended family) which resulted in his reinstatement to HPD as a lieutenant.
In August 2010, Scott Caan injured his knee while filming a stunt for the show and tore an ACL. The injury was written into the show.
CBS wanted to bring the series back one year sooner for the 2009-2010 season, with Edward Allen Bernero in charge of production. The plot would have been a sequel with Steve McGarrett Jr. taking over the unit from Steve McGarrett Sr. It didn't go beyond the scripting stage. In 2009, Alex Kurtzman and Roberto Orci took over and decided to reboot the series instead of make it a sequel to the original.
On the original series, Kono and Governor Jameson were male.
Daniel Dae Kim was the first actor cast. He was followed by Alex O'Loughlin, Grace Park, and then Scott Caan.