The café where the three ladies meet and Diane introduces Oscar to her friends was also the location where director Gary Winick arranged a meeting with Sigourney Weaver before production, to play the part of Eve. After Weaver spoke to the restaurant owner, they agreed to let them use it in the film.
When Oscar helps Eve wash the dishes, before he kisses her, the bowls on the shelf in front of them change, (the rice bowls on the left front) change to behind the saucers.
When Eve and Oscar are playing tennis, Oscar calls the score as "15-30", and then serves the ball to the left side of the court. It should have been served to the right side.