Continuity: When Joy is curling her hair in the bathroom, Jack is standing at the door waiting to use it, and there's a file cabinet with wheels which disappears when Joy comes out.

Continuity: When Joy goes to work after moving in with Jack, she is in a blue dress. When she is at work, her dress is grey - the same one she had on at work at the beginning of the movie, before the break up. But when they meet later at the counselor's, she is back in blue. (Not to be confused with the red jacket she is wearing while she is working.)

Continuity: When Mason runs into Joy at the park, a dog in the background drastically changes positions from shot to shot.

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.

Continuity: In the scene where Joy quits her job, you see she is wearing the ring she just gave to Jack in the scene before.

Continuity: When Joy invites Jack's parents over to his house to eat, his shirt is a long sleeved. Later, when Jack goes to see Joy's ex-fiance, his shirt is short sleeved.

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.

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.

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.