There's an M C Escher copyright notice in the end credits. I didn't spot any of his works featured in the movie, did you? :)
Tss yeah I used to make drawings on an Escher Sketch or sumptin! Fawhkin home run Chipper!!
shareI dunno. Like most, I'm only really familiar with his work with the never-ending and physics-defying stairs. Is he known for other art besides that?
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Censor Censorship!
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I'd say there are four lithographs of his that most people will have seen at some point, even if they may not remember off the top of their heads, all of the physics- and/or perspective-defying variety: "Ascending and Descending" (https://upload.wikimedia.org/wikipedia/en/6/66/Ascending_and_Descending.jpg) and "Relativity" (https://upload.wikimedia.org/wikipedia/en/a/a3/Escher%27s_Relativity.jpg), both of which have stairs, and "Drawing Hands" (https://upload.wikimedia.org/wikipedia/en/b/ba/DrawingHands.jpg) and "Waterfall" (https://upload.wikimedia.org/wikipedia/en/e/e8/Escher_Waterfall.jpg), which show just what the title suggests.
The other thing he's famous for are "tessellations", which are images in which there is no negative space, like the painting-within-a-painting in "Reptiles" (https://upload.wikimedia.org/wikipedia/en/8/8f/Escher%27s_Reptiles.jpg).
You can access the rest of his works from the infobox at the bottom of the artist's Wikipedia article. :)