I can add a few others:
"Split Second": Contestant speaks in Jeopardese, Tom Kennedy turns to Jack Clark and says, "Isn't that right, Jack Pardo?" IIRC, Clark didn't boom "That's right, Art," to Kennedy.
"TJW": Jack Barry feigns ignorance and says to contestant, "What's with all this 'who is' and 'what is' stuff?"
"Jackpot": Geoff Edwards turns to Expert and says, "If you don't stop with all this 'who is' and 'what is,' I'll sic Art Fleming on you!"
"Turn It Up!": Jordan Brady says in his haughty Trebek voice, "correct--select!" (Unrelated to Jeopardese, he once gave an answer in his Trebek voice as "and the answer, players, is--Can-a-da."
"Remote Control": Ken Ober tugs at the collar of his polo shirt and says, "Do these clothes look like they come from Mr. Guy?"