Chevy Chase plays a former unsuccessful but kindhearted agent who winds up getting screwed by his last client, who leaves him after becoming famous, like in Woody Allen's classic Broadway Danny Rose, which is the starting point here.
At the end of the movie, when she is starting the clay model of Al, in the last shot they show of the clay "blob", it looks like Punxatawney Phil out of Groundhog Day, a movie Andie MacDowell was also in.