1) A group of 10,297 balloons carries Carl's house through the sky. However, one of the special shorts when the house lifts off for the first time has 20,622 balloons.
2) How many balloons would it take to actually fly a house? About 26.5 million.
3) Russell's backpack has 19 different pieces of gear attached, 14 of which can clang around and move independently. What's actually inside is still a mystery!
4) Lotso from Toy Story 3 can be seen sitting on the girl's bedroom floor as Carl's house passes her window. One of her other toys is the Luxo ball.
5) When Car'ls house flies over the town, the Pizza Planet truck from Toy Story can be seen in the intersection & also in the Fenton's parking lot.
6) Kevin's design is based on many birds, including: Ostrich - the legs; Heron & other large birds - behavior; Toucan, Quail & Peacock - beak and "Dongles" on his head.
7) Paradise Falls is based on the world-famous Angel Falls in Venezuela. In the film, Paradise Falls is 1.8 miles tall (9.700 ft., which is almost 3 times taller than Angel Falls at 3,212 ft.)
8) Carl wears both a belt and suspenders. His suspenders were not rendered when he wears his jacket, which means you don't see his suspenders whenever his arms are over his head!
9) The Spirit of Adventure is a dirigible, a rigid airship, and not a blimp. It is much larger than any other dirigible ever built. It is 557 ft. tall and 3,061 ft. long, that's 3.8 times longer than the Hindenburg!
10) Muntz's jacket is the first time a Pixar cloth garment has been made of fur. No CG animals were harmed during the making of this film.
11) The Fenton's Ice Cream Parlor in the movie is based on the real Fenton's restaurant in Oakland, CA.