When Pacey opens the present from his dad, the wrapping paper changes color and design.
Pacey turns 18 years old but in "Cinderella Story" which aired ten months beforehand he says he is 16.
Pacey's Birthday is celebrated in this episode, which takes place during the winter in Capeside. However in the Episode "Crossroads" in Season 2, Pacey's Birthday is celebrated in the beginning of the school year. This leaves the exact date of Pacey's birthday in doubt. Correction: Seasons 1 and 2 were both the Sophomore school year of the main characters. Even if Pacey's birthday was celebrated at the beginning of the 2nd season, it wasn't the beginning of the school year.