Yeah I think I know what you're saying. I've done a bit of stage work myself and you sometimes can be distracted by people shuffling about in the wings, the stage manager whispering directions into their mike or someone coughing and spluttering in the front row of the audience. Stage and film acting each are different disciplines I suppose with their own sets of challenges. I've never had a alot of lines just mainly done smaller roles but the "mad mad flailing" I can relate too, especially when the crew plant their traditional booby-traps and gags during the last dress rehearsal. :D