Continuity mistake: When the house first becomes detaches from its foundation and becomes airborne, Russell is nowhere to be seen, although every angle of the house is shown, including underneath, the front porch and the back porch. He knocks on the door and tells Carl he chased a "snipe" under the porch - but he cannot be seen after liftoff and prior to knocking. The same thing happens near the end, when Dug claims to have hidden under the porch.
Trivia: Jordan Nagai, who eventually got the part of Russell, showed up to an audition with his brother, who was actually the one auditioning. However, the director realized Nagai behaved and spoke non-stop like Russell and chose him for the part. A similar situation happened with the casting of Short Round for Indiana Jones and the Temple of Doom, whereby Jonathan Ke Quan was cast when it was actually his brother auditioning for the part.
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Trivia: June 2009, 10-year-old Colby Curtin from Huntington Beach, California, was suffering from the final stages of terminal vascular cancer. Her dying wish was to live long enough to see "Up". Unfortunately, Colby was too sick to leave home and her family feared she would die without seeing the film. A family friend contacted Pixar, and a private screening was arranged for Colby. The company flew an employee with a DVD copy of "Up", along with some tie-in merchandise from the film. Colby couldn't see the screen because the pain kept her eyes closed, so her mother gave her a play-by-play of the film. Seven hours after viewing the film, Colby passed away.