George Carlin refers to chicken eggs as being abortions. Actually, unless a chicken's eggs are fertilized, there isn't even the potential for them to have a life growing in them. This is a very common mistake.
George Carlin refers to viruses as being alive. In truth, they are not considered a form of life.
Stagehand can be seen peeking out from a flat at the back of the stage. He then realizes he's on camera and goes back out of sight.