Continuity mistake: Karen puts the embarrassing picture in the envelope holding it in a different way - she pulls it open with the left hand in the corner in the first and last shot, by the middle of the side closest to her in close-up. (00:31:20)
Character mistake: Lucy says the source of the quote "To err is human" as Alexander Pope's "An Essay on Man." The quote actually originates from Pope's earlier work, "An Essay on Criticism."
Revealing mistake: When the speaker during the first game played says "This game might have had a different outcome", everyone in the crowd looks at a different spot, but the small kids agree on just looking straight into the movie camera. (00:01:25)