Harry and Walter Go to New York - slapstick silliness with Elliot Gould, James Caan, Carole Kane, Diane Keaton and (I think) Michael Caine.   

Also, a wonderful B&W film called Hester Street, also with Carol Kane. A lot of it is in Yiddish with English subtitles, paints a vivid picture of Jewish ghetto life in NY in late 1800s, early 1900s.