This is the first time Phoebe uses her alias name "Regina Phalange" when she's pretending to be someone else.
If you look closely, Chandler's teeth are different in this episode than in the previous one. This is due to Matthew Perry getting his teeth capped during the break between the previous season and this one.
The opening credits are different than usual, showing mostly the events over the last couple episodes.
Rachel travels to Greece. In real life, Jennifer Aniston is half Greek and also lived in Greece for a year.