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)
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.
The Face of the Dragon - S1-E17
Factual error: Two deaths by bubonic plague, spread by casual human contact, have Five-O scrambling to prevent an epidemic on Oahu. But the disease isn't spread this way (its vector is fleas on infected rats). And since the introduction of antibiotics in the 1940s, bubonic plague has been imminently curable, so there was no need for panic, other than, of course, to make the episode more dramatic. (00:18:00)
The Face of the Dragon - S1-E17
Character mistake: Near the end of the episode, McGarrett tells Dr. Kuh "The imposter Lewis Shen murdered your uncle." The uncle McGarrett is referring to was, earlier in the episode, referred to as Dr. Kuh's grandfather. (00:27:40 - 00:46:45)
Continuity mistake: During the stand-off, Big Chicken is standing several inches to McGarrett's left, on the other side of a seam in the concrete wall. When the shot cuts to a closer angle, Chicken is instantly close enough to touch shoulders with McGarrett, and is now blocking the concrete seam. (00:25:30)
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.
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)
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."
A Thousand Pardons -- You're Dead! - S2-E1
Continuity mistake: Pool balls redistributed on pool table between the time after the Sargeant breaks and McGarrett casually takes a shot. Especially, noticeable since Tommy, the other player, does not move off the table's edge after the break when two balls comes towards his position and his bottom or pants may interfere with their travel. In the next shot involving the table, those balls are not there and the rest of them seem more evenly distributed across the table. (00:35:40 - 00:36:10)
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)
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.
To Hell with Babe Ruth - S2-E2
Continuity mistake: When Nagata breaks into the boarded-up house, he walks through a doorway full of cobwebs, covering his black suit with white dust and webs. But when the shot changes, his suit is suddenly perfectly clean again. (00:10:00)
Forty Feet High and It Kills! - S2-E3
Revealing mistake: McGarrett and Victoria watch surfers from the beach. Thanks to the insertion of stock footage, they "see" surfers riding huge 6-foot waves. But in the shots of the actual locale behind them, the ocean is virtually flat. (00:09:30)
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)
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: The bad guys are driving a dark green '62 Cadillac - with fins. After Five-O's sharp shooters fire at it, the Caddy hits a concrete wall. In the next shot of the wreck, the green '62 has turned into a black '64 - without fins. (00:42:45 - 00:44:35)
Visible crew/equipment: At the end, when McGarrett walks around his desk to confront Sloan, the boom shadow sweeps across the wall at the upper left of the screen. (00:47:30)
A Bullet for McGarrett - S2-E6
Deliberate mistake: Han is shot several times as he dives from the board into the pool. But when his body is shown slowly floating back to the surface, there's not a trace of blood on him or in the water. (00:03:30)
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.