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The claim that "Seinfeld was one of the first sitcoms to regularly use callbacks in its scripts" should be very reliably sourced or immediately removed. Callbacks are basically as old as comedy itself, including TV situation comedy. The Seinfeld "observation" reeks of born yesterday syndrome.--IfYouDoIfYouDon't (talk) 02:10, 7 March 2017 (UTC)

While the reaction is by no means universal, and I know of no studies to this effect, audience reaction to callbacks in stand-up comedy regularly involves applause, and not just laughter. It is not the only comedic effect to elicit applause, but it's quite reliable, as becomes clear when one is looking for it. Comedians often end sets with a callback to start the applause, which then grows when the comedian announces the end of the set.

This may or may not need to be included in this article, but the effect is entirely unmistakeable. — Preceding unsigned comment added by 2602:30A:2EE7:4190:E475:1079:1D9D:63D4 (talk) 04:32, 15 August 2018 (UTC)