Continuity mistake: Kealoha puts his gun back in its shoulder holster before walking a few feet across the parking lot to meet McGarrett. When we cut to a two-shot of them, Kealoha puts his gun away all over again. (00:32:30)
Continuity mistake: Auston leaves the unconscious Dan Williams lying on his back. But in the next shot, Danno's lying on his side. Later, the seriously wounded Danno instantly changes positions between shots several more times, switching from face down to face up on the floor. (00:02:30 - 00:32:00)
Character mistake: While trying to figure out how to evacuate the other patients in order to get to Danny, McGarrett mentions a patient's daughter in room 309, but it's mentioned in other scenes that the man and his daughter are in room 306.
Continuity mistake: When Ms. Karabinos is worried her father is dying, she is holding her face in her hands, but then her arms are suddenly down by her sides. (00:24:55)
Answer: He was fired. He never really appreciated his character. He felt Kono was portrayed as a big dumb Hawaiian and that the stereotype was racist. He also felt underutilized. He was fired after a heated argument with the show's publicist regarding his character. It seems there's not much details given regarding the incident or the firing, so it's seems possible he upset the show's producers as well.
Bishop73
No he said something derogatory about one of the Jewish producers that's why he was fired.