21Scary Movie

The school in the Scary Movie (2000) is called B.A. Corpse High School.
22How to Train Your Dragon

In How to Train Your Dragon (2010), toothless’ slight hesitation was actually a glitch in the animation software. The animators decided to keep it in because they thought the timing fits perfectly.
23The Dark Knight Rises

Christopher Nolan’s hidden tribute to Heath Ledger's Joker in The Dark Knight Rises (2012) can be seen in its final scene. The people commemorating the Batman’s statue are seated to resemble a smiley face.
24Prisoner of Azkaban

In the end credits of Harry Potter and the Prisoner of Azkaban (2004), you can see three people running out of the Stink Bomb Store after someone sets one-off.
25The Phantom Menace

In the end credit scene of Star Wars: Episode I – The Phantom Menace (1999), Jabba the Hutt is credited as playing himself.
26Harry Potter and the Philosopher's Stone

In 'Harry Potter and the Philosopher's Stone (2001)', Anne Boleyn, the second wife of King Henry VIII, is in a painting at Hogwarts. She was thought to be a witch.
27Avengers: Endgame

For a brief moment in Avengers: Endgame (2019), there is a brief appearance of Howard the Duck in the crowd of people during the portal scene.
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28The Naked Gun

In The Naked Gun (1988), the Police Lab door's label is half-mirrored; "Lab" is reversed to be readable from the inside.
29Scarface

In the Scarface movie (1983), the character Tony Montana can be seen eating a lemon which is for washing your hands after meal. This shows how poor he was growing up, never being exposed to things of the rich.
30Star Trek

In Star Trek (2009), R2D2 can be seen briefly ripping through space among the other debris.