According to Bethany Joy Galeotti, the script for this episode said "Kiss Nathan, preferably with tongue." It is in the scene where Peyton drives Haley home in the rain and Nathan is apologizing for having pictures of Peyton on his computer.
Final appearance of Thomas Ian Griffith as Peyton's father, Larry Sawyer. When the character returns in later seasons he is played by a different actor.
At about 6:44, you can see Bryan Greenberg's tattoo on the bottom half of his left leg.