1) It's rarely a mistake.
2) She was evidentially too busy gurgling down her side of the story.
3) If he'd done it in person, he'd probably would have strangled her; she's better off having all of York knowing she's "a dirty little tart" (sic) instead of dead.
4) Yeah, the girl was happy at the start of the call. She also asked of the ring "How much is it worth?"
Do you really think someone should have sympathy for a cheating gold-digging beeotch like that?
But you're correct; it was funny, particularly her little choking sounds of dismay at the end...