Rory accuses her mother of setting a bad example when she slept with Christopher when he was engaged to Sherry. At that point, they were not engaged because Christopher didn't know Sherry was pregnant. He finds out at Sookie's wedding, which was the following day.
In Episode 4.04 Chicken or Beef? Taylor asks how many rooms the Dragonfly Inn will have and Lorelai says 10, however in the episode Emily and Richard are in room 12.
This episode must take place in late May or early June, given Rory's school schedule and the number of weeks which have passed since Easter. However, in a previous episode, Lorelai said that the Inn's first real reservation was for May 8th and 9th.