1The Exorcist

While filming The Exorcist (1973), director William Friedkin was notorious for hiding guns around the set so he could fire them during takes, startling his actors to get genuine reactions.
2. In Spider-Man: Homecoming (2017) Howard Stark can be seen painted on a mural celebrating great scientists and inventors.
3. In Sully (2016), the ferry captain Vincent Lombardi, who was the Captain of the first ferry to reach the plane, played himself in the movie.
4. In The Avengers (2012) post-credits scene at the Shawarma stall, Captain America (Chris Evans) is seen resting his face on his hand and not eating anything. This is because the scene was shot too late (after the premiere) and Evans - who was working on Snowpiercer (2013)- had grown a beard.
5. The first terrorist to be killed by Tony Stark in Iron Man 1 is none other than famous American musician Tom Morello, who is the guitarist for Rage Against the Machine and Audioslave. Audioslave's song "Cochise" was used in the second trailer for the movie.
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6Labyrinth

In Labyrinth (1986), David Bowie's face is hidden in several landscapes.
7. In Spider-Man: Homecoming, Bruce Banner's face is alongside the other "famous scientists" on the wall of Peter Parker's physics class.
8. At the end of Titanic, Rose is reliving everyone she met on the boat. When she gets to Jack, behind him there is a clock that reads 2:20, the exact time that the ship sank.
9. In Guardians of the Galaxy, when Peter Quill enters the Temple on Morag, the murals on the wall are of Death, Entropy, Infinity and Eternity, the Cosmic Entities who created the Infinity Stones.
10. In Now You See Me, the very first trick is made by getting an audience member to pick a random card. When the deck is being flipped, the chosen card (7 of diamonds) was shown for a few extra frames to trick the real-life audience to think they have picked the same card as the one in the film.
11Batman Begins

In Christopher Nolan's Batman Begins, every score on the soundtrack is named after a certain genus of a bat.
12. In “The Shawshank Redemption,” Red's photo shown in prison mugshot was really the photo of Morgan Freeman’s son.
13. In Shining, for the scene in which Jack breaks down the bathroom door, the Props Department built a door that could be easily broken. However, Jack Nicholson had worked as a volunteer fire marshal and tore it apart far too easily. The Props Department were then forced to build a stronger door.
14. In The Powerpuff Girls Movie (2002), at almost 17 minutes in, you can see Bubbles spelling her name out in cursive as she's flying around.
15. In the movie “Titanic”, the 4th smokestack can be seen not emitting any thick smoke. That’s because the real Titanic’s 4th stack was a dummy and was only constructed to make the ship look more proportionate.
16Coraline

In Coraline (2009), the character of Mr. Bobinsky has on him the medal of the Chernobyl liquidators, offered to the civil and military personnel who were called upon to deal with consequences of the 1986 Chernobyl nuclear disaster.
17. In “Shutter Island” (2010), inmate Bridget Kearns asks for a glass of water. When she “drinks” it, there is no cup in her hand. She also fake drinks with her right hand and sets a glass down with her left. This is probably because Teddy has a fear of water, and much like reality, his brain can’t handle it, because of what his wife did. So his brain literally blocks out the glass of water from her hand. It’s also why he’s incredibly seasick at the start of the film.
18. In Captain America: Civil War (2016), when Iron Man and War Machine arrive at the airport, War Machine's landing shakes the camera much more than Iron Man's, implying how much heavier his suit is.
19. In Snakes on a Plane, when the flight attendant puts a snake in the microwave they press a “snake” preset button.
20. In Lilo & Stitch (2002), the Stitch’s adoption paper which Nani signs is actually a thank you letter from the directors and producer to the people who helped create the film.
21Scott Pilgrim vs The World

In Scott Pilgrim vs The World, the pee bar animation is reflected in the mirror.
22. The original 1968 "Planet of the Apes" has the three apes on the Ruling Council "see no evil, hear no evil and say no evil," thus reenacting the "Three Wise Monkeys" pose.
23. In Ralph Breaks the Internet (2018), in the same scene as Stan Lee's cameo, Rocket Raccoon from Guardians of the Galaxy can be seen in the background talking to officer Judy Hopps from Zootopia.
24. In Harry Potter and the Goblet of Fire (2005), you can see the snake Nagini slithering in the reflection of the Warner Brother's logo, a subtle detail that's easy to miss. The first shot in the film is of Nagini slithering toward her master.
25. There’s a brief moment in ‘Mega Mind’ (2010) where Metro Man disappears for a couple of frames and then reappears again. This was the moment he describes later on to Mega Mind and Roxanne when saying he took a walk and went away to rethink his life.