If you watch closely Superman is green screen or comped in. You can see the edges around him are a little fuzzy. So Reeve gets into the car as Clark. Maybe he opens the door while staying down and out of the shot, then they green screen in Superman’s exit. On the 4K you can freeze frame and see that even his cape gets a little lost in the effect.

Not to mention the cop lights on top keep moving

Its not seamless, its a composite shot, you can see the car is matted around

The sister, Illeana Douglas, had her own starring movie just a few years before this: Grace of My Heart, which I remember as a wonderful take on an aspiring singer/songwriter.

Tina Majorino and Dennis Hopper gave the best performances.

This movie is a mixed bag but enjoyable

In the pan and scan version (or if you zoom in) you can see a halo around superman, much like old-school blue screen. I suspect they had a double for superman, then superimposed his face

Cop: "Some guy left his clothes in the backseat of my squad car."

I was told it was a split screen. The guy who manages the Christopher Reeve Superman movie websites explained it to me in detail, and what you said about the windshield was accurate. I’ll see if I can get him to explain it again, and I’ll repost it.

It was a double, the cop in the shot is an old friend of mine and he brought it up a few times.