Theatre can entertain, provoke, challenge, investigate, comfort and educate. It's arrogant of a playwright to think education is more important than anything else. Writing for the theatre does not give you permission to lecture, hector or bore.

It is often assumed that money is the only motivational factor. Wrong.Fear is also important. Save money. Use fear!

Sometimes actors don't remember their lines. At its worst, this means they 'dry' and silence descends. More commonly, the original lines are paraphrased in some alarming way. It's hard to say which is more painful for the author. Less serious, but quite irritating is to hear the word 'Well' inserted at the beginning of speeches.