Plot hole: The FBI is looking for a "very tall" guy who has been identified as such by various witnesses and by their own expert due to the entry angle of a fatal bullet wound - 6'5" at least. They send Elena into a bar near the end of the show to meet the Albanian perp who when he arrives is barely average height.
Plot hole: The show starts with the Jupiter crashing into the planet... also the other Jupiter seems to have had problems landing on the unnamed planet... why? The Jupiters were fully capable of flying around the planet as we saw it in other moments. None of them were attacked by the robot, they are not escape pods. So why crash land into the planet? Also why get out of the ship just to be stranded on an icy hellhole? The space ship is waterproof, as we saw in another episode. So why get out just to have one person go in again and get trapped on ice? And that's just the tips of the iceberg, pun intended.
Plot hole: After Ae-sin shoots Wan-ik and flees, Hina shoots Dr. Matsuyama with a six-shooter and plants the gun in his hand to make it appear as if he shot both Wan-ik and himself in a murder-suicide. However, Ae-sin shot Wan-ik with a rifle, meaning the bullets that were used to shoot Wan-ik and the bullet that was used to shoot the doctor were completely different bullets; the authorities would realise this when an autopsy on the two is performed. (00:26:10)
Plot hole: SPOILER! Jamie Dutton is blamed for Beth being sterilized. But shouldn't the doctor be blamed for not informing the patient before the operation?
Casualties - S2-E14
Plot hole: When Bradford and Chen arrive at her apartment to see the damage her newly adopted dog did, she discovers the dog ate her roommate's varsity jacket, but she had to turn the doorknob to open the door; there is no way the dog got into that room if the door was closed.
Plot hole: Cadmus sets a brain-controlled Connor loose in public, without apparently remotely considering the possibility that anything might go wrong. When he regains control all they've got is a few goons onsite armed with regular ammunition - what did they think that would achieve? They know exactly what he's capable of. Either have kryptonite ammo or don't bother having anyone there at all.
Plot hole: In "The Conners" premier, Dan solely blames neighbor Marcy Bellinger for Roseanne's death after finding a bottle of opiates with Marcy's name on it. He only relents after Darlene shows him additional opiates that other people gave Roseanne and were hidden around the house. However, in the Season 10 reboot of "Roseanne", Dan had previously discovered and confronted Roseanne about her multiple opiate stashes, including one bottle with Marcy's name on it which he read aloud.
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.
The Book of Blood: Chapter Two: The Perdi - S2-E6
Plot hole: When announcing the 14 deaths, they make a generic statement to the friends and family of everyone in the pods, without first telling the affected families directly?! There's no way this would be dealt with like that - not least as they all then seem shocked that the parents start a riot/panic about whether their children are dead or not. Anyone with half a brain cell would have seen that coming a mile off. Not to mention that later on we discover one of the parents STILL hasn't been told if his daughter's alive or not. If this was a coverup or otherwise secret they wouldn't have said anything - there's no reason to announce the deaths but not clarify who died.