<P> Many Mackinac Island residents were cast as extras . </P> <Ul> <Li> The movie was filmed on location at the Grand Hotel and the Mission Point Fine Arts building of the former Mackinac College (now Mission Point Resort), both located on Mackinac Island, Michigan . Additional scenes were filmed in Chicago, Illinois . </Li> <Li> Bringing cars onto the island for use in the film required special permission from the City of Mackinac Island . Motorized vehicles, other than emergency vehicles and snowmobiles in the winter, are prohibited on the Island . With very few exceptions, transportation is limited to horse and buggy or bicycle . </Li> <Li> Director Jeannot Szwarc had a slight problem directing the scenes between Plummer and Reeve in that whenever he said "Chris," both men would respond with "Yes?" Szwarc resolved this by addressing Plummer as "Mr. Plummer" and addressing Reeve as "Bigfoot". </Li> <Li> The final scene between Christopher Reeve and Jane Seymour before Reeve's character is thrown back into his own time was difficult for Reeve to shoot as he had just learned that his girlfriend and companion, Gae Exton, was pregnant with his first son Matthew . For much of that day his attention was understandably elsewhere . Reeve says on the bonus material of the 2000 DVD, "The day we shot the picnic scene on the floor I found out, and the world found out, that I was about to be a father for the first time ." </Li> <Li> In the film, Reeve's character consults with a Dr. Finney (played by George Voskovec), a time travel theorist . This is a deliberate nod to author Jack Finney, whose novel Time and Again, published five years before the 1975 Richard Matheson novel Bid Time Return, on which this film is based, features an almost identical theory on the mechanics of time travel . </Li> <Li> Elise McKenna was a fictional actress . Collier is filmed in the library searching and looking through an old theater album, which has photos of historic stage actresses . The three little girls are Blanche Ring and her sisters . A child holding a doll is actress Rose Stahl . A faded picture of a woman in nun's habit is Ethel Barrymore in a 1928 play, The Kingdom of God . (Barrymore's head is left out of the frame as she would be readily recognizable by alert fans of old films .) </Li> <Li> Elise McKenna's character was loosely based upon the life of theatre actress Maude Adams, who was born Maude Ewing Adams Kiskadden in Salt Lake City, Utah on November 11, 1872 . She died in Tannersville, New York on July 17, 1953 . Her manager, Charles Frohman (the basis for the William Fawcett Robinson character) was very protective of her . He died on the RMS Lusitania on May 7, 1915 when it was torpedoed by a German submarine during World War I . </Li> </Ul> <Li> The movie was filmed on location at the Grand Hotel and the Mission Point Fine Arts building of the former Mackinac College (now Mission Point Resort), both located on Mackinac Island, Michigan . Additional scenes were filmed in Chicago, Illinois . </Li> <Li> Bringing cars onto the island for use in the film required special permission from the City of Mackinac Island . Motorized vehicles, other than emergency vehicles and snowmobiles in the winter, are prohibited on the Island . With very few exceptions, transportation is limited to horse and buggy or bicycle . </Li>

Where did they film the movie somewhere in time