I've often mentioned that I think one of the best recoveries from a blooper occurs in Ep #1018 when Frid as Barnabas mistakenly asks KLS as PT Maggie if Quentin was really in love with Josette (rather than Angelique):
and without losing a beat, but with just the furrow of her brow, KLS says, "Josette? I think he was in love with Angelique." And the scene progresses from there as if the slip-up had never happened.
If only every blooper could have been covered so well.