When Discord is having afternoon tea with Fluttershy, he noses around and discovers some large adult diapers. His first assumption about them, though, might not be correct...
“Sorry, need to retune myself to the right setting, or I'll be calling myself John next,” Discord told her. He gave himself another whack which twisted his head around three hundred and sixty degrees, then shook himself. “There we go.”
I don't get this bit, could you explain?
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He's referring to John DeLancie (his voice actor) and Andrea Libman (Fluttershy's VA)