Continuity: In this episode they are celebrating the Geller's 35th wedding anniversary. In "The One with Rachel's Book" it is revealed that the Geller's got married because Jack got Judy pregnant with Ross. This means Ross would have to be about 34 years old. Since this episode aired in 2002, Ross would have been born in 1968. However, Ross's year of birth is inconsistent. In "The Pilot" (1994) Ross says he is 26, implying he was born in 1967. Also, in "The One Where Monica and Richard are Just Friends" (1997) he says he is 29. However in the next season in "The One Where They're Going to Party" Ross also says he is 29, implying he was born in 1968. Furthermore, in the next season in "The One Where Phoebe Hates PBS" Ross says he is about to get divorced again before he's thirty, implying he is still 29 and born in 1969. Also, in "The One with the Video Tape," Ross claims that he backpacked across Europe in 1983 then whispers to himself "I was thirteen?" implying he was born in 1969 or 1970.
Now another continuity issue appears. In "The One Where Rosita Dies" Jack Geller says that Ross was a medical marvel, since the doctor said Judy couldn't get pregnant, implying that they were already married. So would Ross really be 34 at the time of this episode?