In the entire first film, Boromir wears arm armor with the symbols of Gondor. Before the death of Boromir, Aragorn promised him he wouldn’t let Gondor fall. When Boromir heard these words, he accepted Aragorn as his king. When Boromir died, Aragorn took his arm armor.
1
The Fifth Element
In the plot, the fifth element was supposed to unite with the 4 elements of Earth in order to fight the incoming evil. At the beginning of the movie, we see the hieroglyphs of all the elements: each of them consists of 5 lines. It would make sense for Leeloo to have a tattoo on her arm to unite all 4 elements. And she has it. But for some reason, there are 6 lines instead of 5.
2
Inside Out
In some Pixar animations, you can see the same noodle box, which is another point in the theory that all Pixar films are in the same universe.
3
The Twilight Saga: New Moon
When Bella spends months near the window after Edward breaks up with her, you can see the photos of her friends disappear one by one. This was a sign that Bella was cutting herself off from the entire world.
4
Coco
In the land of the dead, the characters use outdated technology, like for example, a Macintosh from the ’80s.
5
Harry Potter and the Chamber of Secrets
The beautiful hair of Gilderoy Lockhart was just as fake as all of his achievements.
6
I Am Legend
In the film, there are many posters around abandoned New York. But one of them stands out. It’s Batman v Superman: Dawn of Justice. Warner Brothers didn’t make the film until 9 years later.
7
Joker
Every clock in this film is set to 11:11. There are many fan theories about this one, namely that it’s a sign of Arthur’s insanity.
8
Snatch
Avi is an alias. His real name is on his desk sign: Abraham Denovitz. This is how we can deduce that the jeweler from New York is related to another character — Dug Denovitz, a jeweler from London.
9
Harry Potter and the Half-Blood Prince
In the first 2 films about Harry Potter, the quidditch players didn’t have numbers on their uniforms. The numbers appear in The Prisoner of Azkaban for the first time, and then we see them clearly in the 6th film. This was a hint that Harry was Voldemort’s 7th horcrux.
10
It
Pennywise secretly watched his victims throughout the whole film.
11
Harry Potter and the Goblet of Fire
The symbol of the deathly hallows appears in the Goblet of Fire 2 years before readers even learned about them in the books.
12
Baby Driver
Graffiti and other signs echo the lines from the song in the main characters’ earbuds.
13
The Conjuring 2
The only way beat the powerful demon that terrorizes people is by calling his name — Valak. The name can be seen several times but the characters don’t notice it.