A then unknown Suzanne Somers doubled for Carol White during the climax atop The Top the Mark hotel bar.
According to Los Angeles Times, producers originally sought Marlo Thomas, Candice Bergen or Jane Fonda for role that went to Carol White.
The airplane at the beginning shown taxiing at the San Francisco International Airport is a 1968 Pan American Boeing 707, registration N496PA, named "Jet Clipper Northern Eagle". It flew with Pan Am until 1980 when it left the fleet and its registration was subsequently canceled in 1984.