Of course it wasn't accidental. It was a deliberate reference back to 'Doppelgangland', just as the reprise of the "I think I'm kinda gay" line in 'Tabula Rasa' was. It just wasn't anything more than that, and Joss certainly hadn't planned what happened in Season 6 that far back.
by Sydney
hummmmmm - I think Dan is right with gay comments regarding Evil Willow, but the 'Bored Now' line was too well placed to be accidental.
Well exactly. As the Jane Espenson thing says, Joss does that all the time. Probably just so the fans think he's cleverer than he actually is.
Bearing in mind that its always easier and more likely to reference back than to hint at something before the event