Continuity mistake: Recycled footage is again a bit too obvious here, when McGarrett's 4-door Mercury suddenly becomes the 2-door model he drove in the pilot film. It also causes him to arrive, exit the car and walk into the building wearing a grey suit, but enter the Federal agent's office in the next shot wearing a blue suit. (00:25:00)
Continuity mistake: McGarrett's left hand rests on the side of the large multi-line telephone as he makes his call. The camera angle reverses, and his hand instantly jumps to a different position, resting on top of the phone. (00:41:00)
Plot hole: 8-22 "Love Thy Neighbor, Take His Wife": McGarrett has two unexplained clairvoyant moments in this episode. First, he divines that the Indian-style headband is turquoise without seeing it. Then, after the kidnappers' phone call proves untraceable, he somehow knows that it was made from a specific pay phone.
Continuity mistake: 8-9 "Retire in Sunny Hawaii - Forever": When Danno leaves his car, he's wearing a brown suit, but he enters Ellen's office wearing a black one.
The Ransom - S3-E6
Revealing mistake: McGarrett paces in his office, and when the shot cuts to a close-up of his feet, the actor's blocking mark is visible, chalked on the carpet.
Continuity mistake: 8-13 "A Touch of Guilt": The assault is said to have occurred at the Zanza Bar. But when we see the location, the bar is called The Makai Lagoon Club instead.
Continuity mistake: 7-1 "The Young Assassins": The hotel towel draped over the first victim's beach chair instantly changes positions between shots. You can see the words "Aloha, Hawaii" emblazoned on it, until the shot changes. Then it's moved up, and only the word "Hawaii" and the hotel's logo are showing. (00:01:50)
3,000 Crooked Miles To Honolulu - S4-E4
Factual error: The professional hitmen murder their victim in the hospital with a silenced .38 revolver. You'd think the mob would know better. Silencers have absolutely no effect on revolvers. They only work on closed-chambered, automatic weapons. (00:46:20)
Continuity mistake: McGarrett wears a blue suit on the ride to the airport, but when he gets out of the car, his suit is brown.
Continuity mistake: 8-15 "Deadly Persuasion": Danny says he hasn't fired his old 45 automatic "since I got out of the service." But at least two previous episodes had established that he joined Five-O right out of college, and was never (not even before college) in the service.
Death is a Company Policy - S5-E1
Continuity mistake: The Five-O computer here lists McGarrett's name as Steven J. McGarrett. But in "A Gun for McGarrett," his middle name is revealed to be Aloysius. Strange that the computer doesn't know the name of its own department's head.
Air Cargo -- Dial for Murder - S4-E7
Visible crew/equipment: When the bad guys enter the print shop, the boom shadow moves across their heads and onto the wall behind them. (00:11:10)
Continuity mistake: When Angela is talking to Sloan, her position in the hotel room chair changes back and forth noticeably between takes. (00:02:30)
Continuity mistake: Danno drives to Brohme's house in a black 1966 Ford Galaxy 500, but arrives in a green 1969 Ford LTD. (00:41:05)
Other mistake: The CSI technician dusting for fingerprints on the gun isn't wearing gloves. He proceeds to pick up the gun in his, ungloved hands and hand it to an ungloved police officer thereby adding their fingerprints to the gun. Very sloppy police work.
Continuity mistake: After murdering the cop, Frank and Luther steal a rifle from the squad car, then close the door. No one goes near the car again, but a few minutes later, the door has re-opened itself. (00:06:00 - 00:11:15)
Revealing mistake: In the intro, one of the scenes involves a revolver being loaded as the cylinder is spun. The bullet being loaded and all the others have already been fired - there's a firing pin mark on each primer. (00:00:55)
Continuity mistake: McGarrett has infiltrated a crime syndicate and is standing on the patio of a beachside house with two men and a woman while Danno, in a boat several hundred yards offshore, is taking pictures with a camera and telephoto lens. When the pictures are developed, the background in the photos is the ocean, not the beach house and patio.
Character mistake: To get on board a private yacht, Carl Swanson poses as a repairman from Mauna Loa Refrigeration Company but the name on the back of his uniform is misspelled "Muana Loa."
Cocoon (1) - S1-E1
Other mistake: After the funeral, McGarrett walks up to his friend. You can see not only McGarrett reflected in the man's shades, but the spotlight illuminating him following him along the wall.
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.