A telephone interview fir a FILM project? ...I guess it would be a still-life - 30 minutes of a telephone on a desk; RIVETTING! At least your focus should be sharp...
I was a dub kid in the late 50's... your interviewee may remember the book "From Paradise Lost to Paradise Regained," with its explicit illustrations of death and destruction as a result of Gd's righteous judgements. This was a book aimed primarily at KIDS, and the message was clearly "SAVE YOURSELF BY WORKS."
Later came other fine Bible study aids, like "BABYLON THE GREAT HAS FALLEN - GOD'S KINGDOM RULES" and "THEN IS FINISHED THE MYSTERY OF GOD."
In 1967 the book "Life Everlasting-in Freedom of the Sons of God" began the BIG count-down to 1975 (though other, earlier books pointed at the early 1970s but didn't make a big deal of it). In 1968 the emphasis was on the "life-saving" door-to-door witnessing work, and special instructions were provided that if a new bible student did not progress to baptism in 6 months, they were to be dropped and considered a waste of time, because Armageddon was closer than the inside of your eyelid!
We also saw the emphasis on the sanctity of blood and the flip-flopping about whether organ transplants were permissible for God's people. We also learned that if a Christian was raped and did not scream, that Christian was a FORNICATOR, because no scream implies consent.
Yes indeed, those were the days!