21Inside Out
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.
22Indiana Jones
While escaping Nazi Germany on a blimp, Indiana Jones's father reads a German newspaper to appear inconspicuous. The newspaper is upside down.
23The 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.
24Captain 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.
25Lord of the Rings
Peter Jackson cameos his children in each of the movies of the Lord of the Rings.
26Osmosis Jones
In Osmosis Jones (2001), there is a Pikachu held by a germ in the bladder.
27Black Panther
In Black Panther, Angela Bassett knows Shuri did something offensive behind her because of T'Challa's horrified expression.
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28The Road To El Dorado
In The Road To El Dorado, when Tzekel-Khan is flipping through his ritual book, an Aztec/Mayan version of the Dreamworks logo can be seen on one of the pages.
29Dennis Nedry
Dennis Nedry from Jurassic Park wearing similar outfits to characters in The Goonies. Kathleen Kennedy was the producer on both.
30Avengers: Infinity War
In Avengers: Infinity War, Gamora tells Thanos she always hated his chair. Thanos then sits on the step leading to the chair to show that he really does care for Gamora.