Lewis seems to be just playing himself, a cantankerous old man, no silly face pulling here "thank god" a very disjointed type of movie that's full of pointless closeups and a dismal soundtrack, poorly acted, badly directed, it's hardly surprising that Lewis himself hailed it as a perfect film, and instantly wanted to be in it after reading the script, he poured praise on the casting, directing, writing and musical score.
Which proves how much he knows.
Best avoided unless you happen to like Jerry Lewis talking in a monotonous voice for 90 minutes