21Spider-Man: Into the Spider-Verse
In Spider-Man: Into the Spider-Verse, Gwen's origin story shows subtle, blue traces of scales on the body of her universe's Peter. This is a reference to the comics, in which Peter turned himself into the Lizard.
In Baby Driver (2017), Baby flips through the channels at one point and later repeats all of the dialogue he hears from the TV.
In "Up" (2009), Ellie's things are rounded while Carl's things are square, matching their respective character designs.
24SpongeBob Squarepants Movie
In the SpongeBob Squarepants Movie (2004), there is a fish in the Thug Tug eating a bowl of nails without any milk.
In Toy Story, Woody is trapped in a crate which is stuck under a ‘Binford’ tool-box. Binford is the fictional tool company in the TV show Home Improvement which starred Tim Allen, the voice of Buzz Lightyear.
In Inside Out (2015) two of the memory orbs on the shelves contain scenes from Up (2009). One features Carl & Ellie's wedding, while the other shows their house.
While escaping Nazi Germany on a blimp, Indiana Jones's father reads a German newspaper to appear inconspicuous. The newspaper is upside down.
28The Wizard of Oz
The famous shot from The Wizard of Oz (1939) where "sepia-tone" Dorothy opens the door and walks out into Technicolor Oz was done by having an extra wearing the same costume but painted brown. The extra opens the door, and then Judy Garland (in her colorful costume) walks into frame and out the door.
29Captain America: Civil War
At the end of Captain America: Civil War, the only marks on Cap's shield are from Black Panther's claws since both are made of Vibranium.
30Lord of the Rings
Peter Jackson cameos his children in each of the movies of the Lord of the Rings.