Toni's braids when she is on the dock looking for Andre.
Just before the "Johnny Angel" 45 goes flying out the window, the title on the turntable is actually "Pretty Paula".
Andre the seal was played by a sea lion but it was acting, and playing the part of a seal for the movie - it's a Hollywood thing.
Early in the movie, which takes place in 1962, the song "A Lover's Concerto" by The Toys can be heard playing on the radio. However, this song was not released until 1965.
The film takes place in Maine, but there are shots where the Rocky Mountains are clearly visible.