The Bell model 47 Helicopter was commonly called the "Bubble" copter.
In the closing credits Efram Zimbalist Jr. was driving a white colored 1971 Ford LTD Brougham 2-door Coupe.
Not one but two helos used. Both are Bell model 47's. The one (FAA# N3079G) was also the "Batcopter" in the 1966 Batman movie!
Guest villain Michael Douglas would rise to prominence in another Quinn Martin series, THE STREETS OF SAN FRANCISCO, where he played Inspector Steve Keller from 1972 to 1976.