Three of the main characters were the same actor, and yet there are shots with all of them in the same scene. When I saw this as a young adult I didn’t even notice that Mike Myers was playing three roles and was genuinely dumbfounded years later when I found out.
How did they do those scenes so seamlessly?
https://www.wired.com/video/watch/design-fx-inside-orphan-black-s-amazing-visual-effects
If you haven’t seen it, “Orphan Black” is a BBC show about a group of clones being hunted down by their creators.
One actress played about 20 different roles in the series; and there were a few scenes where all the clones were in the same room together.
Great show and a masterclass in acting.