A Thousand Pardons -- You're Dead! - S2-E1
Factual error: Danno, who's posing as a Marine, has hair that's far too long to be permitted in the Corps. In fact, all of the Marines in this episode have non-regulation (too long) haircuts. 'T'was the same then as it is now: US Marines are given "buzz jobs," and hair longer than an inch is not allowed.
A Thousand Pardons -- You're Dead! - S2-E1
Factual error: At the end, Simms shoots at McGarrett and is instantly riddled with bullets from the 8 or 9 cops who shoot back. Yet, when McGarrett walks over to the body, there are no holes - and no blood - marring Simms' pristine uniform. (00:48:00)
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.