Trivia: When Carl's house begins to lift and the little girl looks out her window, the Luxo ball from Pixar's other films is seen in her room.
Trivia: The Pizza Planet truck can be seen waiting at a stoplight when Carl's house first begins floating over the city.
Continuity mistake: When Mr Fredrickson opens the door there are 4 locks on the front door looking from the outside in. Next scene and consequent scenes there are only 3. (00:12:35)
Trivia: A scene in the airship of the dogs playing poker is a homage to the same named series of pictures painted by C.M. Coolidge. A further detail is that instead of having an ace up his sleeve, one of the dogs has the ace hidden in his collar.
Continuity mistake: When Russell is trying to mount the camping tend for the night, one of the stakes bounces on his face, giving him a bruise on the left eye, but in the next scene the bruise is gone.
Answer: According to writer/director Pete Docter, Carl was 9 and Muntz was 23, so if Carl is 78 in the rest of the film, that would make Muntz about 92.
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