This episode aired after the "Big Brother Is Coming" 2-parter. Will and Grace act like Grace hasn't dated anyone since Danny, but she was with Will's brother Sam. This is due to the fact that the episodes were aired out of order rather than a problem with continuity.
The descriptions for this episode listed guest star Tom Bosley as "the town barber-turned-hair stylist" whom Will and Jack meet at the pub after ordering their drinks. Apparently, his scene was edited out because it wasn't funny.
When Karen says to Grace if she wants to find out if Campbell is "mm-mm-good" she is referring to the 1980s and '90s Campbell soup advert.