The lady on the phone at the St. Louis' Bijou Theatre is actress Ann Robinson, best known for playing the lead female role of Sylvia van Buren in the 1953 George Pal sci-fi classic "The War of the Worlds".
Sandra Gould, who plays the San Diego telephone operator, is best remembered for playing the second Gladys Kravitz on Bewitched from 1966-1971.
When making a phone call, Gilligan reaches the St. Louis Bijou Theater. The theater is showing Dracula Goes Surfing, which stars Carol Summers and Gregory Bryan. As a companion film, they are also showing Frankenstein Goes Surfing.