Trivia: This is only on the DVD. As Hoggle walks off saying "There's one thing for sure, she'll never get through the labyrinth" look at the top left corner of the screen and you'll see the face of Jareth (David Bowie.) You see his face again, when Sarah and friends are walking through the forest, and Sir Didymus says "We should reach the castle well before day." Look at a tree to the right of the screen and you'll see the face.
Trivia: When Billy's mom takes the picture of Gizmo at the beginning, Gizmo becomes frightened and runs over to Mr. Peltzer. When the scene is slowed, you can see the puppeteer's hand underneath while operating the Gizmo doll. Not a mistake as needs slo-mo, but worth a look. (00:19:10)
Trivia: During the scene in the senate, after the shot of a Senator calling for order, we see pods with aliens in them. Towards the lower left you can see a pod full of E.T's. There's also a pod full of Wookies making their traditional noises, played for the first time in 20 years by someone other than Peter Mayhew. (01:25:30)
Trivia: Stephenie Meyer makes a brief cameo appearance at Bella and Edward's wedding. She is the author of the Twilight books.
Trivia: A subtle reference to this film's 3D format: In Max's box, Trevor finds a pocket stereoscope, which are funky looking glasses that create the illusion of a three-dimensional image from two-dimensional photographs. It was invented by Sir Charles Wheatstone in 1840.
Trivia: Numerous references to other Tim Burton films: a) The dress Katrina Anne Van Tassel wears at the end is similar to Beetlejuice's outfit. b) Crane has various sharp scissor-like tools, which is a reference to Johnny Depp's early film "Edward Scissorhands" (1989). c) The scarecrow at the beginning looks exactly like Jack from "The Nightmare Before Christmas" (1994). d) The covered bridge is a lot like the bridge in "Beetlejuice."
Trivia: Stan Lee makes his customary appearance as the driver of the white pickup truck that tries to free Mjolnir from the ground. (00:36:10)
Trivia: The Anabelle doll from The Conjuring, another film of director James Wan, is visible while Mera is taking Arthur to her submarine ship. Blurry but there.
Trivia: At the end of the film when Scrooge is going round being nice to everyone, as he's on his way to the Cratchit's house, we see in the background a shop called "Micklewhite's". This is Michael Caine's real surname. (01:20:55)
Trivia: When Keith Richards is looking up the rule in the pirate code book, the skull ring on his finger is not a prop; he has worn it since receiving it for his birthday in 1978 from a famous London goldsmith, who used a real skull when modelling the design.
Trivia: There is a scene where Hercules is being painted on the side of a vase or something. Hercules is wearing a lion skin - when he throws the lion skin down, if you look carefully, you can see that the lion skin is made out of Scar, from The Lion King . (00:55:20)
Trivia: Stan Lee makes his usual cameo, this time as a patient at the asylum where Selvig is being held.
Trivia: In the open-matte print, right after the credits, the support beams of the movie lot walls are visible, painted in blue to simulate the sky. In the theatrical version and the current Disney+ streaming movie's original aspect ratio (bottom picture), one can still see the beams for a split second after the postman puts the letter in the mailbox (though there's no way here to identify them as lot walls).
Trivia: In Cloud City, when Chewy finds C-3PO in pieces in what looks like a droid scrap room, you can see what looks like the upper half of IG-88 leaning up against the wall. It is revealed later in books to be the IG-88 unit that went in search of Han, but was intercepted and destroyed by Bobba Fett.
Trivia: Pinocchio is sitting in the rafters above Flynn Ryder during the "I've Got a Dream" scene.
Trivia: During the big fight between Batman and Superman, a broken window has the same shape as Ontario, in Canada. Superman creator Joel Shuster was born in Toronto. The broken window is only ever shown from Superman's angle, not Batman's. This was confirmed by Zack Snyder as being a deliberate, if obscure, easter egg.