I just wanted to let you know I think you may have your episodes mixed up... the one where Ross 'goes out' (babysits) with Amanda (Joey's girlfriend), Rachel doesn't actually talk straight to Joey that entire episode... Joey is mostly with either Kathy or Chandler or both, and with Josh (her high school boyfriend, to make Ross jealous) or fighting with Ross!!! But, there are a few episodes where Rachel says, "Honey," that is mumbled and could sound alot like other things!! (Definitely not Lee though!)
I dont think she would have called him Lee in an episode but even though it s his last name she would still call him it as on set he hes known as LeBlanc as tehre are two Matts