David Vincent can be seen smoking a cigarette in the final chapter of the episode even though actor Roy Thinnes does his best to disguise it.
Sadly, actor Frank Overton passed away of a heart attack just two months after this episode of The Invaders, which he appeared in, aired in February 1967. He was only 49 years old.
Lieutenant Lucather (John Larch), in helping David Vincent (Roy Thinnes), despite the fact it may end his career, asks him if knows of any jobs for a 51-year-old ex-cop. Larch was actually 52-years-old.