Continuity: When Mason runs into Joy at the park, a dog in the background drastically changes positions from shot to shot.
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Continuity: When Joy is preparing to pop the champagne for her boss she grabs the bottle and slides the knife on the bottle. The metal cage on the cork of the bottle is intact; however when she pops the bottle, the metal cage is removed.
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Other: In the scene where Ashton Kutcher hits the 3 million dollar progressive jackpot, he only puts one quarter in the slot machine, but the machine payoff schedule shows that two quarters are need to hit the progressive.
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Continuity: At the party, when Joy rips Jack's name tag that says, "Hello I'm Joy's Bitch" and puts it on the other woman's dress, it moves from diagonal, to straight, to diagonal, to straight on the back of the dress.
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Continuity: After Joy shows her boss her wine bottle/knife trick, she pours a glass of wine, and when the shot changes the bubbles disappear instantly.