“Why bother making up science if you’re going to ignore it?”

"It breaks its own rules and logic in order to move the plot forwards. Ashton Kutcher's character transports his consciousness back in time to his kid self and impales his hands on some pencils at school as a kid in order to make scars appear on his hands in future when he's stuck in prison, so that he can convince another prisoner that they are stigmata and he is Jesus or some sort of holy guy. This is not how projecting his consciousness back in time works in any other instance in the film.

The whole point is that changing a small thing in the past has big repercussions on the future, as we see from the multiple different timelines he experiences from changing one thing at key moments of his life. In this instance, nothing else changes apart from scars on his hands, despite the fact that, by the film's own logic, it would clearly cause a divergence from the current timeline.

Also, when he does this, he stays in the same timeline but the scars suddenly appear on his hands. Again, this breaks the rules the film established for itself, as the new timeline would overwrite the old one – it should be that, as far as the other prisoner was concerned, the scars were always there in this timeline; he wouldn't see them appear."

"In Aladdin, his second wish is ‘Make me a Prince’, so the all-powerful Genie makes him a prince and then, for the rest of the movie, he’s trying to hide that he’s not a prince, even though the most powerful creature on Earth made him a prince.

Note: he didn’t say, ‘Make me look like a prince with a crazy parade to trumpet my arrivals at the palace’; he said, ‘Make me a prince’, and the Genie even said his name was Prince Ali Ababwa."

"It's always frustrated me that in Ant-Man they go to the effort of explaining the fake science and then immediately ignoring their own explanations.

We're told the Pym Particles work not by shrinking atoms, but by shrinking the distance between atoms. They then start shrinking smaller than atoms, which shouldn't be possible if you haven't shrunk any of your own atoms.

Why bother making up science if you're going to ignore it? Just tell us it shrinks atoms and then it would work."

"Time Turners in Harry Potter sort of blow that whole universe wide open."

"Introducing time travel into a story is always a can of worms. Introducing time travel as something that's so easy and common that a child is given a time machine to attend more classes is ridiculous." 

"There was no way for Biff to return the DeLorean back to unaltered 2015 after giving his younger self the almanac."

"Nightmare on Elm Street has a scene where she's struggling against Freddy before being woken up. This should have pulled him out of the dream world, but that doesn't come into play until later on when she grabs just his hat."

"In The Matrix, Cypher has to go into the matrix alone to meet with Agent Smith and betray the crew. The entire movie explicitly establishes that you must have an operator to plug you in and watch the screens to get you out. Who was his operator?!"

"It's been done to death with questions about the logistics of bringing a crying baby into the world or why they don't live by a waterfall, but I wanted to touch on just how impossible it would be to live in the world without making any noise.  

Whenever you went to sleep, you'd be gambling on whether you'd wake up or not due to snoring.I'm a chronic snorer due to sleep apnoea, so I'd be fucked from the get-go. But any small amount of snoring would trigger the monsters' senses. A sneeze, a fart, a stomach rumbling. It would be impossible. On the baby side of things, even if they had precautions and fail-safes for the birth, can you imagine trying to raise a young child in that environment? Teaching a toddler not to make noise and stressing the dangers of what happens if they do? Nah. They're cooked."

"Why didn't they just dump the fish man in the nearby harbour in The Shape of Water?"

"In the new Star Wars trilogy, somehow, the First Order had more money, logistics, support, personnel and equipment than the entire Empire, which was the enslaving government of its time.

The Empire had the resources to build two Death Stars, with all the planetary and monetary systems to support that effort, yet the First Order, a fringe element, had more resources to build a planet-sized machine, fleet and troops. Who paid for all of it?

The resources from a couple of rich groups or systems pale in comparison to an enslaving government with control of hundreds of systems."

"Not necessarily a plot hole as much as it is a plot necessity, but I found it weird in Aliens how there's literally no one else on the Sulaco apart from the Marines, Ripley and Burke, and everyone just drop-ships down to the planet, leaving the Sulaco unattended. As far as I know, almost every other ship we see in this universe has an actual crew of some sort (pilot, captain, engineer, etc.), but not this one.

Things may have gone less awry if there was someone on the Sulaco who could remote-fly the second drop-ship!

I adore the film, and obviously understand why from a plot perspective, but it always seemed a bit weird to me and, to my knowledge, it's never directly addressed."

"Weapons… I legit can’t get over the fact that the missing kids are in the house of the one kid who didn’t go missing, and the explanation for why the cops didn’t find them was the witch/villain ‘moved’ them all out of the house before they arrived. Ummm… what? Trace evidence, doorbell/camera footage would be able to solve this in 24 hours. 

What a complete letdown despite such a cool premise for a movie. Some great acting and elements in that movie, but what a completely botched story with plot holes galore. AN ENTIRE CLASS OF STUDENTS GETS MOVED WITHIN THE SAME TOWN FULL OF THEIR PARENTS/COPS/FBI… TWICE… AND BROLIN AND THE TEACHER HAVE TO SOLVE IT THE SAME WAY THE COPS SHOULD HAVE SOLVED IT IN THE FIRST 24 HOURS."

"In Limitless, Bradley Cooper takes a drug that maximises his intelligence and is fully locked in…but not locked in enough to remember that he owed money to Russian mobsters."

"In The Martian, there's supposedly this huge sandstorm that makes the crew take off at the beginning of the book/film.

From a physics standpoint, it's not possible to have these kinds of strong storms on Mars because the atmosphere is way too thin. But the weirdest part is that it's even mentioned in the book/film later that Mark Watney has been driving through a Martian sandstorm without noticing it, because that's what a sandstorm on Mars would physically really look and feel like.

I was really bummed out when I first heard this because it's one of my favourite books."

"In Law Abiding Citizen, when Nick stops Clyde.

We're supposed to believe that this super-smart, cunning, dangerous man who managed to kill someone using a thread hidden in a tie is bested by a district attorney who is dead set on furthering his career and isn't that smart.

Not only that, but it also surprises me how fast they got the bomb to his cell from the mayor's office.

Honestly, Clyde should have won in this story. The film is great, but the ending is shit."

"The whole point of the plot of Clue (1985) is that it's a giant plot hole, but there's a subtler plot hole that would ruin everything if anyone actually noticed it while viewing the film.

Mr. Boddy turns out the electric lights in the room where all the guests have gathered and someone grabs the gun in the dark to kill him. But there's a fire in the fireplace. Turning out the lights would make everything firelit and moody, but not nearly dark enough to conceal a murder attempt."

"In Oceans Eleven (2001) they place the 'money' in the elevator so that the casino can take it outside to a van, which drives away.

Then they enter the bank vault disguised as the SWAT Team, place the real money into the SWAT Team bags and leave before the Casino realizes that the bags they gave to the van wasn't really the money, but was instead flyers for hookers.

And the flyers for the hookers came from...where, exactly? Danny and Linus don't have them with them when they enter the vault. They're not in the trolly with Yen. They are there before the SWAT team arrives. They have enough of them to convince the Casino that the bags really are filled with tens of millions of dollars in cash. And they seemingly materialize out of thin air when the movie needs them to exist."