Continuity mistake: This relates to the scene where Greg is doing crunches and Rose is helping him exercise. Greg gets a cramp in his lower right back, and Rose goes to massage his back for him. He walks to the bathroom, but instead of rubbing his lower right back, he rubs his lower left back instead.
Revealing mistake: On their wedding night Rose and Greg watch 'Lawrence of Arabia' on video, lying in their separate beds. When the movie is over Rose comes and switches the TV off, but before she does that you see a reflection of her in the TV where she is standing there and waiting for her 'turn'.