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Other mistake: When Nick is in the spoon, the milk around him turns green.
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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).
Chosen answer: Russ says he learned it in French class because giving mouth to mouth resuscitation looks similar to French kissing.
Phaneron ★