Comedy comedy is a science, you must learn the science 1. Actors have a tendency to love moments , business and gestures. Don't just invent business, but must have timing , technique and find motivation. How is the audience reacting at this point. Director likes it or enhance it, that's all.
Director thinks in results.
Actor has to make it happen. Actor in this industry has to be ruthless, selfish, aware of everything that is going on. In the end, it can't look like acting.