The first hint of a cross-over between Magnum P.I. and Hawaii Five-0 (2010) series is the character Lieutenant Yoshi Tenaka, who states in the first episode, "if this is a kidnapping, it belongs to HPD and Five-O, not some private eye."The second was the appearance of the character, Dr. Noelani Cunha, portrayed by Kimee Balmilero , who is the medical examiner in the later show. Finally there is the appearance of Kamekona, played by Taylor Wily in the second episode of the revived series.
In the original TV series there is no mention of Magnum saving Robin Masters life in Vietnam. In fact, the premise of the show is that Magnum works as head of security on the estate, and he spends every opportunity trying to discover Robin's true identity. Moreover, trying to confirm one of his beliefs that Higgins is secretly also one in the same as Robin Masters.
In the first episode, Magnum crashes a different model of Ferrari than what was used on the first version of the show. When Magnum checks out another Ferrari the producers pay homage to the original series by using a 1983 308 GTS QV with the license plate reading "Robin1."
At 40 years old when starting the part of Thomas Magnum, Jay Hernandez is older than Tom Selleck was when he started the part of Thomas Magnum at 35 years old with the character supposed to be in his early 30's
The State of Hawaii, Hawaii Tourism Authority (HTA), uses Hawaiian Tax Dollars to fund Productions of Magnum P.I. and Hawaii Five-0. As well as Business Incentives, Tax Breaks, Tax Credits, Free Use of State land and other properties, further increasing Hawaii Citizens Tax Burden.
With regards to the wasting of tax dollars, the following applies: Hawaii is not part of the mainland Continental United States, so everything has to be imported by sea and air, and as a result, Hawaii's Cost of Living will be higher than the national average. Due to that reason, the State of Hawaii needs to provide tax credits to these production companies to defray the cost of filming, otherwise it is just cheaper to film elsewhere. That being said, the production companies hire local crews which brings jobs to the community and the shows serve as an hour-long television commercial which draws tourists to Hawaii and vital revenue into the state's coffers. Thus, these decisions to allocate tax dollars are not made lightly, it is a question of whether the benefits outweigh the costs.