John's apartment is actually two different locations. His bedroom and his living room were filmed in two different apartments.
Caroline Turner was initially called back only for the Amanda role. During the audition she asked to read for Isabella and won the part.
The original intention of the butterfly forest was to look extremely amateurish and hand-made. However when the set was completed, it looked too good and it was incorporated into the story that John was a decent artist.
The last names of the three main characters are Fisher (John), Hamill (Isabella), Ford (Amanda). These are the same last names as the stars of the original three Star Wars films: Carrie Fisher, 'Mark Hamill', and Harrison Ford.
The butterfly garden set was filmed at the Memphis Zoo Butterfly Exhibit.