The shot of the aircraft carrier coming into San Francisco Bay at the beginning of the movie was completely unplanned. The entire crew were at the time on the Presidio's parade field, along with hundreds of off duty soldier, filming a staged parade. When director Hyams saw the fleet coming in, he stopped filming of the parade to get a shot of the ships going past. In the final cut of the movie only a few seconds of the parade are shown at the beginning, and the rest of the day's shoot was left on the proverbial cutting room floor.
Meg Ryan's character goes out on a date wearing a very short black mini-dress. At the end of the date as she leaves to go home, her dress reaches almost to her knees.
In the title sequence you see a Nimitz classes aircraft carrier putting to sea going under the Golden Gate Bridge, this shot being taken from the north side of the bridge. In the next cut you see a Nimitz classes aircraft carrier putting into San Fransisco, this can be deduced as the shot has the Presidio in the foreground, which is at the southern end of the Golden Gate Bridge, and the ship is moving left to right
A water delivery truck driving past taxiing airplanes would not be possible on any U.S. Air Force base. Commercial deliveries are not permitted to be made on the flight-line side of buildings.
What are the differences between the R-Rated and Unrated Version?
A
The sex scene between Jay and Donna is longer in the Unrated Version. The latter hasn't been released in the States yet but can be found on the German DVD. A detailed comparison between both versions with pictures can be seen here.