During their golf game, Bob calls golf, "a good walk spoiled". This is what Rory calls golf in Kill Me Now (2000) when she goes golfing with Richard.
Kirk's speech before the Easter egg search is a tribute to Howard Dean's yell in a speech earlier that year.
Lane says: "There was a death-to-disco movement in the late '70s, very intense. We had Donna Summers on the run!", to which Rory replies: "We? You weren't born yet". While the characters Rory and Lane were both born in 1984 on the show, actress Keiko Agena (who plays Lane) was actually born in 1973 in real life.
Floyd calls Jason a "duffer" which is a word sometimes used to describe an inexperienced golfer.
The song playing in Rory's car when Dean stops her to talk is Windy by the Association-1967.