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.
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.
13Men in Black
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).
14An 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.
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.
16X-Men: Days Of Future Past
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.
17X-Men First Class
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 fuck yourself"; which became the line used in the film and also gave a genuine reaction from McAvoy and Fassbender.
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.
19Harry 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.
20What We Do in the Shadows
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.