Coincidentally, I was going to mention this Universal film, which DR Michael just referenced, because I just watched it two nights ago for my first time in probably 30 years: TWO-MINUTE WARNING. I'd remembered so little of it that it was almost like seeing it for the first time, and what an incredible time-travel couple of hours it provides.
It's the kind of "terrorist" thriller they made in the 1970s, and I can't get enough of them. The beauty of this one is in the actual filming locations. Not only do you get some nice ca-1976 Los Angeles, but -- and I went back over it to check this out -- it might be one of the most realistic and "honest" location films I know. In other words, when a scene takes place at the Coliseum, for instance, or at the Sunset & 405 Holiday Inn, all of the related area shots (streets, freeway off-ramps, etc.) do so as well. It's rather a marvel in this respect.
I never saw that notorious TV version, but I see it's on the recent Shout Factory Blu-ray, and that's going right into my cart.