Since the Stooges did a lot of ad libbing and improvising
A common statement, and in connection with their films, mostly untrue.
As Ed Bernds once told me, the films' schedules and budgets did not allow for ad libs and improvisation. The films were tightly scripted, and filmed accordingly. Shemp would often finish a scene with a hilarious ad lib, and sometimes it would stay in, but frequently it was not used.
My work with Jules White's files over the past 10 years confirms Bernds' statements. From the scores of scripts I've gone through, I'm being generous to say that 95% of what's onscreen, was in the script... and that's inclusive of slaps, pokes and "nyuks." The Adler and Bruckman scripts were more detailed; the Ullman scripts not as tight on "bits of business," but still specific.