A closeup of David Vincent's California driver's license indicates that his date of birth is October 2, 1934 (making Vincent four years older than actor Roy Thinnes), he is 5'9", weights 170 pounds, and has brown eyes and brown hair. His home address is listed as 4022 Laguna Street, Santa Barbara, California 93101.
The same large gear mounted on a shaft is seen in many episodes, makes its first appearance inside an aircraft (Ivy Curtain). In one episode ("Summit Meeting" in the circle gallery) it's even painted in bright colours and pops up both outside and inside the gallery.
Jack Wardens plane was a 1941 Douglas DC3A-S4C4G serial number 4815 registration N128D.
In the bar scene, a Muzak version of the song "Call Me" made famous by Petula Clark can be heard.
Barney Cahill (Jack Warden) is offered $1,000.00 for each "student" (alien) he transports for Midlands Academy. That 1967 offer would be worth about $7,681.00 in 2019.