Continuity mistake: In the very last scene of the movie where Chris O'Donnell and Renee Zellweger are on the terrace taking their vows, Renee is holding a bouquet. In one shot it is a bouquet of pink flowers, then it changes to a bouquet of yellow flowers and keeps switching back and forth throughout the scene.
Continuity mistake: Near the beginning of the film, when Chris O'Donnells's Grandfather gives him his grandmother's engagement ring, Chris takes the ring out of the case to look at it. He is holding it between his fingers and examining it closely. We then see a closeup of Chris holding the ring in its case. When we see a long-shot of Chris right after this, he is still holding the ring in his fingers.