Continuity mistake: During Kate and Steve's day off, while talking by the kitchen counter, Steve's hand is either up or down without any continuity at all.
Continuity mistake: After Steve kisses Kate's face covered in cream, the amount of cream on his face decreases between one frame and another, watch for the mustache and left side of his lip.
Continuity mistake: At the beauty parlor, Kate holds her mobile with both hands, as shown in the close and wide angles. However, when she says goodbye to a friend, in the wide angles she now holds it with one hand, but the close-ups still show two hands around the cell.
Continuity mistake: While Larry floats drowned in the pool, the rubber hose tied around his neck suddenly changes to tied around his waist.
Continuity mistake: When the movie starts Summer is talking to Larry, sitting on the couch. His crossed feet keep swapping positions without any logic, right over left or the other way around.