Continuity mistake: 9-4 "Man on Fire": McGarrett's blackboard already lists plutonium as the poison source before Dr. Ormsbee enters to inform him that plutonium was the poison source.
Visible crew/equipment: During McGarrett and Chin's interview with the Chinese bookie, the boom dips into the shot several times at the very top of the screen. (00:20:20)
... And They Painted Daisies On His Coffin - S1-E7
Continuity mistake: When McGarrett arrests Big Chicken at the end of the episode, he twists Chicken's right arm up behind his back, but then in the next shot, Chicken's arm is up above his head on the door in front of him. (00:49:10)
Plot hole: 8-22 "Love Thy Neighbor, Take His Wife": The police cars speed to Tanaka's house with their sirens screaming, warning him in plenty of time to allow him to escape. Apparently these guys never heard of the law-enforcement standard "silent approach."
Visible crew/equipment: Several times in this episode, the side of McGarrett's shiny black Mercury sedan mirrors an entire bank of big square studio light reflectors. (00:35:00)
Continuity mistake: As Kono talks to Johnny Kalama in the students' apartment, an orange lava lamp sits on the shelf between them. Each time the camera angle reverses, the wax bubbles in the lamp are very noticeably in different positions and configurations. (00:41:00)
Plot hole: The first murder victim is so dim-witted that it strains the viewer's credulity. Her creepy blind date, who plans to kill her, is wearing surgical gloves already - but somehow she never notices.
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.
Factual error: During the shoot-out at the end, McGarrett's 6-chamber .38 caliber police special fires 8 rounds without being reloaded.
Visible crew/equipment: 8-16 "Legacy of Terror": As an HPD cop escorts the old man out of McGarrett's office, he trips over a camera cable and nearly falls. When the actor recovers his footing and finishes his exit, the cast regulars simply pretend it never happened and go on with the scene.
All the King's Horses - S2-E10
Audio problem: When McGarrett and Danno pull away from the curb in McGarrett's big black Mercury, the tire-squealing sound effect begins before the car actually starts to move. (Doesn't happen unless you're flooring it and "peeling out," which they're not.) (00:41:50)
Deliberate mistake: 9-12 "The Bells Toll at Noon": When McGarrett picks up Danny and drives away in his Mercury Grand Marquis, the rear view mirror is missing, probably removed to prevent it from blocking the actors' faces. It reappears later on. (00:33:00)
Plot hole: McGarrett is hunting for heroin dealers who've laced the drug with arsenic. Yet when he and Chin Ho arrest Harry Parch and find his stash, McGarrett performs the TV cop cliché of sticking his finger into the white powder and tasting it. Even that small a dose of arsenic could be lethal, and seasoned cop that he is, McGarrett would know that. (00:29:30)
Bored, She Hung Herself - S2-E16
Factual error: Don, who professes to be a Buddhist, chants in the jail cell and refers to Buddha as "god." Adherents to this religion do not worship the Buddha and never refer to him as god. Later on, Don chants to Krishna, a Hindu deity not even remotely connected with Buddhism. So, just what is Don - a Buddhist or a Krishna? (00:12:30)
Follow the White Brick Road - S4-E23
Visible crew/equipment: Aboard the smaller boat that comes out to pick up McGarrett from the tug, you can plainly see a cameraman shouldering his camera and standing up to film the tug boat.
Continuity mistake: Danno, posing as a photographer on the beach, snaps the shutter at a bikini-clad girl and quips, "I only wish I had some film." Seconds later, he takes a picture of the suspects that's then used to identify them. The scene is continuous, and at no time did he ever load film into the empty camera, nor did he have another one. (00:34:30)
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)
Factual error: Throughout this episode, the Japanese assassins are inaccurately referred to as "the Bushido." They should, as the episode title implies, be called Samurai. Bushido was the revered code by which Samurai warriors lived, but was never an appellation for them. (00:17:30)
Forty Feet High and It Kills! - S2-E3
Visible crew/equipment: When Wo Fat's lackey drives away from the Chinese pharmacy, his car door reflects the camera crew and set lights. (00:37:45)
The Bomber and Mrs. Moroney - S3-E22
Continuity mistake: The HPD snipers watch McGarrett's office window, trying to get a clear shot at Collins. In camera views from inside the office, there's a coat rack with a hanger on it standing in front of the window. But in all the shots from the snipers' POV, the coat rack isn't there. (00:40:00)
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.