Bill Warren wrote:
I'm curious as to why someone concluded that THE INVISIBLE STRANGLER was made for TV in the first place.
Just based on the filming technique, the flat lighting, the staging of the action, the choice of camera lens, etc, I would have sworn it was a TV movie. I've certainly never seen a theatrical poster for it.

I also doubt I'm the only person who thinks (either wrongly or rightly) that it's a tv movie either. This review online says:

THE ASTRAL FACTOR is, I believe, a made-for-TV movie (I say I believe because it's listed as a made-for-TV movie, but it uses 4 curse words and shows 2 naked rears. Granted one of them belongs to a 1970s Stefanie Powers, so I'm not complaining) starring Robert Foxworth as Charlie Barrett super cop, and Frank Ashmore as Roger Sands, the invisible strangler (INVISIBLE STRANGLER was an alternate title). The production quality is very much made-for-tv, but the acting is pretty good, even if the wardrobe is just this side of "holy @#$%!!"
So all I'm saying is that maybe it's not outside the realms of probability that reasonable people might think it was a tv movie.