Corrected entry: The movie is set in 1967. When the husband comes out of the neighbor's house he tells Mia to call 911. 911 was not used as the national emergency number until 1968 (the first ever call using it was February 16, 1968). California only adopted 911 in 1972.
ScRiZ
22nd Oct 2014
Correction: The husband John asks the wife to "call an ambulance" not "911" when he exits the neighbours' house.
But the operator answers "911 operator".