Real names, and dates:
                                                Chico (Leonard) 1886-1961
                                                Harpo (Adolph) 1888-1964
                                                Groucho (Julius) 1890-1977
                                                Zeppo (Herbert) 1901-1979

A fifth brother, Gummo, real name Milton (1897-1977), left the troupe before they moved to Hollywood.

In the second half of the film Chico is seen limping, due to a car accident in which his knee was injured.

The two opposing schools were called Darwin and Huxley.  Thomas Huxley was the biologist who promoted Charles Darwin’s Theory of Evolution.