Knight Rider Archive wrote:Whaaaaaat?!
But... how did they get them in two places at the same time?!

That's the magic of Hollywood.
Back then, they had two choices...or, maybe three.
1) Look alike actors. Not likely the choice in this shot.
2) Split screen editing. By filming the same scene twice with the same character playing both roles, they could mechanically (Or, maybe digitally...by that point) splice the final product together to perform this very convincing performance. One trick involves the background. Like, in that shot, there is this vertical pole and a solid color next to it between Michael and Garth. That's where the splice point is hiding at. Another trick is avoiding the actor to attempt to physically move over the space of the splice point. So, the "two" can't touch each other or walk into one another's space. That would blow the whole effect.
3) A very cleaver person might figure out how to use mirrors and some other means. Just including it as that's not beyond impossible.
In more recent times, the progression of technology has permitted some mind blowing things to become possible. One such shot that stands out in my mind comes from the ABC comedy series Roseanne. In the closing credits, two actors come into the scene from the left, deliver a line and walk off the right...ONLY to walk back in from the left side. The shot is close up. And, the repeat this over and over and over...even at one point, walking off the left side WHILE walking in on the right. I have no idea how they did that. Not like era of the show had computers advanced enough to do that. Two sets of actors that looked and talked EXACTLY ALIKE??? I may never know.
Another thing I may never know came out of a movie I just saw. The camera's POV was one constantly sweeping motion. In the past, a very well done camera operator could work inside tight, on-location spaces as the actors gave their lines and moved about in one take from room to room. This was more impressive. Not only did the camera levitate into and out of a second story window to keep up with characters walking on the street, but it made a turn around the corner of a building in an alleyway, followed a guy to his vehicle and kept the shot close up upon him as he drove down the street for a short distance before stopping and stepping out. I nearly missed the magic of how smooth and gravity defying this grand example of cinema trickery truly was. And, I may never know how they pulled that one off. Computer visuals are becoming very impressive and budget cheap, too. Just last night, I caught a $1 sci-fi where the actors basically ran around in a sand dune, one hallway and a closed room that could have been a closet. The lines they gave were mostly second rate. Filming could have been done in a hurried week. And, most of the movie happened in virtual space or a mixture of real and false images. Depending upon how detailed the shot tried to be, the visuals either sold the scene or looked like a higher end video game. Still, this low end movie used visuals that only so many years ago, could only be touched by a million dollar production. So, when the camera pulls off incredible visuals, these days, got to wonder if it was real or virtually created.