The professor's "prank" of staging an altercation before a class of startled students is actually often used in law school criminal law courses in order to demonstrate the unreliability of eyewitness evidence to future attorneys.
The last of four appearances in the series by Barbara Pepper. She would soon take on her most identifiable role, Doris Ziffel ("mother" to Arnold the pig) on Petticoat Junction (1963) and Green Acres (1965).
Patricia Breslin and Kent Smith would go on to work together in several episodes of the Peyton Place television program the following years.
The handgun used is a Colt 1903 Pocket Hammer .38 ACP.
Last of three appearances in the series by Patricia Breslin. She's accused of murder in all three.