Hollywood regularly tells studio audiences to not wear white, as it is very hard to film. Here, the actors' costumers didn't get the memo: Barnaby's white jacket collar creates optical illusions on-camera (its very skinny blue stripes become totally warped) and, mid-show, Betty is wearing mismatched shades of white when she shows up at the marina with a white turtleneck and a clashing white skirt, with chevron blue lines. (In the blinding sun, her top even appears ecru, which is a fashion "don't" to mix it with white. In indoors scenes, it appears a different shade of clashing white.)
A year earlier Mark Shera was on the S.W.A.T. TV show Deadly Tide: Part 1 & 2 investigating the death of a scuba diver. Alan Gornick was the underwater cinematographer on this Barnaby episode and the S.W.A.T. shows.
The plane was carrying a refugee woman who had fled Viet Nam to come to America. This aired about 18 months after the Fall of Saigon/end of Viet Nam war.