Check with the Steve Galbraith double, but I'm thinking everyone was in on this except Old Lee. It was like Invasion of the Body Snatchers.
The Invasion of the Body Snatchers. A great movie. That is the original 1956 black and white version. None of the remakes are nearly as good.
What made it superior?
• Character development. The first third of the movie has no real action. It just introduces us to the principal characters where we get to know develop a fondness for them, which helps us root for them later on. Very important.
• Set in a small town where everyone knows each other, so the characters can always try to evaluate and wonder if someone has really changed or not.
The remakes all go in different direction.
An interesting character is ‘The Skeptic’. A character who makes reasonable and rational arguments explaining away the otherwise inexplicable events. Of course, it turns out that ‘The Skeptic’ is part of a Large-Secret-Enduring conspiracy for aliens to take over the world.
The interference of the studio, insisting on tacking on a ‘Happy Ending’, actually made for a much superior movie. Because the central tragedy of the movie was not the impending doom of mankind.