<Li> Susan Henning as Susan / Sharon double </Li> <P> The film originally called for only a few trick photography shots of Hayley Mills in scenes with herself; the bulk of the film was to be shot using a body double . The film used Disney's proprietary sodium vapor process for compositing rather than the usual chroma key technique . When Walt Disney saw how seamless the processed shots were, he ordered the script reconfigured to include more of the special effect . Disney also wanted Mills to appear on camera as much as possible, knowing that she was having growth spurts during filming . </P> <P> The film was shot mostly at various locales in California . The summer camp scenes were filmed at Bluff Lake Camp (then owned by the Pasadena YMCA, now by Habonim Dror's Camp Gilboa) and the family camping scenes later in the movie at Cedar Lake Camp, both in the San Bernardino Mountains near the city of Big Bear Lake in Southern California . The Monterey scenes were filmed in various California locations, including millionaire Stuyvesant Fish's 5,200 acres (21 km) ranch in Carmel and Monterey's Pebble Beach golf course . The scenes at the Monterey house were shot at the studio's Golden Oak Ranch in Placerita Canyon, where Mitch's ranch was built . It was the design of this set that proved the most popular, and to this day the Walt Disney Archives receives requests for plans of the home's interior design . In fact, there never was such a house; the set was simply various rooms built on a sound stage . Camp Inch was based on a real girls' camp called Camp Crestridge for Girls at the Ridgecrest Baptist Conference Center near Asheville, North Carolina . </P> <P> Richard and Robert Sherman provided the songs, which, besides the title song "The Parent Trap", includes "For Now, For Always", and "Let's Get Together". "Let's Get Together" (sung by Annette Funicello) is heard playing from a record player at the summer camp; the tune is reprised by the twins when they restage their parents' first date and that version is sung double - tracked by Hayley Mills . (Hayley's own single of the song, credited to "Hayley Mills and Hayley Mills," reached #8 on the US charts .) The film's title song was performed by Tommy Sands and Annette Funicello, who were both on the studio lot shooting Babes in Toyland at the time . </P>

Where was the original parent trap camp filmed