The bus scene towards the beginning shows the blue bus at a distance as a "San Diego" bus. The close up shot of Harry in the bus window shows "MON" - a Santa Monica "Big Blue Bus"
When they are driving to the airport, the car is travelling faster during the closeups of Harry than when the camera is focused on Gertrude.
The actors playing naval officers had distinctively non-military haircuts, even for the 1970's.