Not That Much Different - S1-E23
Continuity mistake: When Steve is questioning Lannie Devereaux, his arms change position several times on the back of his chair, without him actually moving. (00:24:15)
Not That Much Different - S1-E23
Factual error: In the final shootout scene at the end, Manning's .38 caliber 6-shooter pistol fires 8 successive shots at McGarrett without being reloaded. (00:45:00)
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.