The Countess - S1-E4
Plot hole: Rockford and Carl Brego are punching and kicking each other on the beach. Someone shoots him down with a rifle. The INSTANT Rockford goes to check out if he's still breathing, two people randomly happen to walk on him popping over from behind a rock as they were having a super casual and amused chat, but see Rockford by the shirtless brute and make a horrified face. Later in the episode the two identify Rockford and say that it looked like the two were fighting. Their facial expressions at the time don't make sense as depicted. Even if we assume that they did not see anything at all and they played it up/filled the blanks in their mind later, the two are not deaf and yet they were not perturbed or curious in the slightest after the loud bang of a gunshot. The way the scene was shot, the only thing tipping them off about anything was seeing Rockford over the corpse (which had barely a small dot of blood visible at the time and would hardly tip anyone off at first sight). (00:18:45)
The Cat Who Cried Wolf - S1-E7
Plot hole: Magnum finds the cat with the bloodied paws. He takes the cat home, arranges with Higgins what to do, brings it back where he found it, and tails it for "over an hour", Higgins says. Finally finds where it came from, and in the house there's a corpse. Shenanigans ensue, Magnum comes back with the police to a now empty house and he tells to Katsumoto that it was not empty "a couple hours ago" and is amazed at how quickly and efficiently the bad guys must have cleaned. The problem is; later we see through the security cameras what happened, and how Max the cat got the blood on its paws. Supposedly the villain did an ultra-efficient job cleaning everything up after Magnum's visit...but what about before? Magnum arrived a good 2 hours after the homicide. What on Earth did the killer do during that time? The dead guy was still lying around in a pool of blood, and the bad guy hadn't even picked up his own ski mask! Forget it. He did not even close the front door.
Episode #1.3 - S1-E3
Plot hole: The killer is meant to create the perfect crime, but the angle of the shot would make obvious to any forensics examiner that it's a suicide. There is practically no possibility for a person supposedly positioned across a long dining table to kill someone else with a shot under the chin. (00:55:50)
Plot hole: During Ryder's report, as Bruce and company watch it on TV, the camera suddenly zooms in on Joker standing on a catwalk above Ryder, and none of the crew, especially not the camera man who caught the villain, makes a comment about this. They may have thought the Joker (or rather an impersonator) was perhaps a surprise gag in the show, but since this is supposed to be a serious documentary report, it is still strange that they wouldn't point it out.
Plot hole: The mysterious neurosurgeon Dr. Quinn was mentioned by the fake Myles Taggart under the pretence that his presence was announced by the local newspaper. It turns out that his invitation by the university was a lie - presumably no newspaper story existed at all then, or the university would have acted on that. Taggart is exposed as a fraud, Quinn's link to him is so direct that he was even the one who invited him (instead of goading the Colonel into inviting him like it was his own idea) and yet the Colonel continues to trust Quinn blindly - he even has the whole night and day to think about this simple fact, nothing was decided on the spur of the moment.
Plot hole: It's revealed that the gym owned by Ray and Terry is a front for Ray to launder his income. This is why he doesn't want or can't sell it. Any person auditing that gym would know it doesn't bring enough income if the floors are in disrepair and the equipments garbage as Terry tells Pie when he gives him money to fix it up after Mickey pays him. Ray runs a consulting firm, he could launder millions through consulting, he has an office with employees. Get vending machines, anything that's cash. (00:42:00 - 00:44:20)
Second Sight - S4-E7
Plot hole: Kimble enters the bar in the midst of a fight between photographer Howie and a man he tried to blackmail. Kimble comes in too late to hear what the scuffle is about, yet after breaking it up, he somehow knows all about the incriminating photo that sparked it. (00:06:00)
Deathfist 5: Major Crimes Unit - S2-E15
Plot hole: The whole case is solved because of astronomical coincidences, since the culprit is someone related to the actor, who is teaming up with the investigators for an entirely unrelated reason. Los Angeles is kinda too big for this sort of 'coincidence'. Moreover, had they committed the crime any other day (there was no particular reason) there would have been no connection.
A Deadly Net - S2-E2
Plot hole: S2E2 A Deadly Net Midway through the episode, Sylvia and others in the cast bid people goodnight, offer after-dinner drinks, but the sun is shining brightly and continues to do so for quite a period of time as events continue to unfold.
Episode #1.2 - S1-E2
Plot hole: Contrary to any other version (including the novel), here the mastermind behind the murder realises in timely fashion that burning the letter was a mistake, it was not actually part of the plan. With this change, they'd have still all the time in the world to go back to the compartment and get the burnt remains, but they simply do not.
Episode #4.1 - S4-E1
Plot hole: When DCI Roz Huntley kills Forensic Coordinator Tim Ifield the crucial piece of damning evidence is her DNA under his fingernails after scratching her arm. Problem being, at the time of his murder, he was wearing surgical gloves. (00:56:40)
Plot hole: Early in the show, Jamie is in a patrol car escorting a witness when they are attacked by several guys in a van. The side windows of their cruiser seem shatterproof and withstand many bullets, while the rear window is shattered immediately. NYPD cruisers do not have bulletproof windows.
Woman in the White Hat - S2-E4
Plot hole: Ronnie and her daughter, and son-in-law spot a pick-up truck towing a large trailer through her plantation. Ronnie runs to her truck to investigate. When she arrives, which could only be a few minutes behind the truck and trailer, there are technicians well into the process of mixing chemicals.
Is the Total Black, Being Spoken - S2-E3
Plot hole: Jimmy was willing to give Cathy $10k in cash for her troubles and to help her out. She wanted to sell drugs instead of getting his charity. Now he's having a problem fronting her the same amount of money worth of drugs. He's saying his dealer will hurt him if he doesn't pay him back. Makes no sense how he had $10k to give her and now he needs her to pay back the $10k front of product he gave her. What happened to his $10k worth of charity? Why can't he use that to pay it off? (00:42:04 - 00:43:25)
Plot hole: In series 5 episode 13 where Jim Fenner frames Karen Betts, the CCTV footage shows this to be July 2003. Yvonne Atkins is killed a few episodes later. In season 7 episode 10 it is said to the be the 1 year anniversary of Yvonne's death, placing this as sometime after July 2004, yet Jim Fenner's tombstone shows a death date of 12th July 2005. In series 7 episode 1 Tina O'Kane sets fire to a clothes shop and is sent to Larkhall, where in series 8 episode 7 it is said she has served 4 months on remand and set free. But in series 7 episode 11, Neil Grayling tells police that Jim Fenner has only been in the post for a few months. The time periods of all of these events cannot be reconciled.
Plot hole: Michelle and the girls are winning at Baccarat every time due to a system where they know the cards in advance by seeing through them. However, all betting in that game is done before cards start coming out of the dealer's card chute onto the table. So even with their cheating system, they realistically couldn't always win, as the cards are not already face down on the table.
The Case of the Deadly Toy - S2-E27
Plot hole: Claire Allison spends the night in an upstairs bedroom in the Jennings' home. In the middle of the night, she opens a walk-in closet to get another blanket and finds a small printing press. Later in the day, Claire returns to the home, accompanied by Perry Mason, who tells Mr. Jennings that Claire has received threatening letters from Mrs. Jennings' former husband, who still has a key to the Jennings' home, and the printing press may have been used to address the envelopes. Mr. Jennings says, "We'd better investigate" and immediately goes upstairs and opens the closet, even though neither Claire nor Perry Mason said where Claire saw the printing press.