A bonanza of victims. Bradford Dillman, Martin Milner, Richard Anderson, and Dean Stockwell were in the film, though I couldn't tell if the last two were in the photo. Did I miss any?

Dean is at the far right. And elsewhere we will see Richard Anderson too as you point out!

Aside from the bizarreness of the coincidence, also striking is that it's roughly a 10-year difference between that movie and Columbo but it looks like a totally different time. I don't know if it's my age or whatever but I don't think looks change as much anymore.