When Claire guesses that Phil got a new haircut, he says he got one a week ago. In the previous week's episode, Gloria was cutting his hair while giving him advice on his fight with Claire.
When Haley and Alex are fighting over wearing each other's sweaters and Haley mistakes Albert Einstein for "Back To The Future's" Doctor Emmet Brown, this is likely a reference to the show's co-creator having the same name as actor Christopher Lloyd.