1Batman V Superman

In Batman V Superman (2016), for his fight with Superman, Bruce Wayne prepares Smoke Grenades with the letter "Pb" written on them. According to Comics "Lead" is the only thing Superman can't see through.
2. In Ant-Man and the Wasp (2018), the lab is portable and therefore can’t be connected to the main power grid. Since they needed portable energy, you can see in the background that they used enlarged Duracell batteries to power the lab.
3. In The Lord of the Rings: The Two Towers (2002), in the battle of Helm’s Deep, one of the Rohan soldiers only has one eye. This was real, not CGI. Peter Jackson let the extra, Wayne Phillips, show off his condition.
4. In Harry Potter and The Half-Blood Prince (2009), Cormac McLaggen is the only one of the Gryffindor fans not clapping and cheering for Ron Weasley, as he lost his place on the team to Ron in the Quidditch tryouts.
5. In Wall-E (2008), the captain is physically incapable of wearing the original captain’s uniform, so he just wears it around his neck with the top button.
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6Ferris Bueller's Day Off

In Ferris Bueller's Day Off (1986), during the parade, people seen dancing including the construction worker and the window washer had nothing to do with the film. They were simply dancing to the music being played, and John Hughes found it so humorous that he told the camera operators to record it.
7. In Jurassic Park(1993), there is a scene where the raptor opens the door to the kitchen and you can spot an operator grab the raptor's tail.
8. In Spider-Man: Into the Spider-Verse (2018), you can see a poster for “From Dusk Till Shaun”, a sequel to Shaun of the Dead (2004). This was a real pitch written (as a joke) by Simon Pegg.
9. In Harry Potter and the Deathly Hallows Part 2 (2011), Harry, Ron, and Hermione easily navigate past a troll, spiders, a werewolf, and dementors. These are all antagonists of the first 3 films and demonstrates how powerful our protagonists have become.
10. In E.T. (1982) the doctors trying to save E.T. were played by real-life doctors from the USC medical center in Los Angeles. Stephen Spielberg felt that actors wouldn’t be able to make the medical dialogue sound natural, so recruited real doctors to deliver the dialogue.
11Dr. No

In Dr. No (1962), Bond notices a painting in Dr. No’s lair and stares closely at it. This painting is the ‘Portrait of the Duke of Wellington’ by Francisco Goya. It had been stolen in 1961. The filmmakers included it as a little in-joke, suggesting that Dr. No had stolen it. It was recovered in 1965.
12. In Harry Potter and the Order of the Phoenix (2007), in the Dumbledore's Army, all the girls are wearing skirts except Ginny (3rd from left) who is wearing pants; probably a hand-me-down from her brothers.
13. In The Dark Knight Rises, in the after-credits scene, Alfred was about to pay for his coffee but as soon as he sees Bruce, he realizes that Bruce must own that café, so he puts his card back in his wallet.
14. In Moana (2016), Moana has a pig and a rooster as sidekicks during the film. It is a sailor tradition to get a tattoo of a pig and a chicken on each foot in order to survive a shipwreck. This is because chickens and pigs often survived shipwrecks due to their buoyant containers.
15. In 'What We Do in the Shadows' (2014), The main characters each pay homage to classic or well known Vampires. Petyr as Count Orlok from Nosferatu, Deacon as Bela Lugosi's Dracula, Vladislav as Gary Oldman's Dracula, Viago as Louis from Interview with the Vampire, and Nick representing Twilight.
16Harry Potter and the Chamber of Secrets

In Harry Potter and the Chamber of Secrets (2002), Lucius Malfoy slaps Draco's hand with his cane in one scene. Jason Isaacs didn't know there were small fangs on the top, so Tom Felton's pain was genuine.
17. In Rocky (1976), when he runs through the Italian marketplace, the people's amused expressions as they look on is genuine, as they had no idea why a man was running back and forth being followed by a van. The man who throws him the orange was completely improvised.
18. In X-Men First Class (2011) Hugh Jackman used 8 takes to try to get his line just right. The line was original, "f*ck off" but on the 8th take Jackman improvised by saying, "go f*ck yourself"; which became the line used in the film and also gave a genuine reaction from McAvoy and Fassbender.
19. In X-Men: Days Of Future Past (2014) when Wolverine awakens in the past, the girl he wakes up next to calls him Jimmy instead of Logan due to the fact he hadn't lost his memory from the adamantium bullet yet. His real name is James Howlett.
20. In Coco (2017), Héctor spends the movie with torn clothes and without shoes. It's only at the end when he is welcomed back to the Rivera family that his clothes are clean and has access to the family's legacy: shoes.
21An American Tail

In An American Tail (1986), the color of the statue of liberty is historically accurate. As the film is set in 1885, the year the statue was completed, it still has its bright copper coloring. It was only after 1900 that the statue turned green due to oxidization.
22. In Men in Black 2 (2002), J tells T to “Get married. Have a bunch of kids" and then hooks him up with a waitress (played by Alexandra O Hara). In Men in Black 3 (2012), the waitress reappears as a housewife with several kids (she is played by the same actress).
23. In the Harry Potter Movies (2001-2011), Snape’s costume was the only one that never changed. According to costume designer, Jany Temine: "Because it was perfect. When something is perfect you cannot change it.” She joined during the production of Prisoner of Azkaban and changed most costumes except Snape’s.
24. In 'The Matrix' (1999) the way Neo and Morpheus attack each other with the same move, their clothes, and head/hair forms the Ying-Yang Symbol.
25. When a tiny person pours tea from a tiny teapot in 'The Secret World of Arrietty (2010)', it comes out as a droplet.




