Thomas wears headphones while making a cassette recording and using a microphone, which doesn't make sense. He doesn't need to hear himself, and he risks getting some ear-piercing feedback.
Magnum: A person is what they throw away.
T.C.: I've heard that some private investigators don't even do any of that bone-numbing research and that they actually con other people to do it for them.
Rick: Yes, I've heard that also, but surely that can't be true.
The German episode titles are "Schule der Schnüffler" ("Private Eye School") and "Mord für Anfänger" ("Murder for Beginners"). The French title is "Meurtre 101", an exact translation. The Italian title is "Investigazione privata, primo corso", meaning "Private Investigation 101".
Larry Manetti was involved in an accident prior to the shooting of this episode, and although his injuries aren't really evident on screen, they limited his activities for a few episodes.