"Velocity" also began its life as an idea being tossed around during season one. The team thought about having an episode devoted to small town drag racing, as it was a problem in the Vancouver area while they were filming season one. The story was eventually used in season three, when the writing staff was looking for a reason to exploit the changing friendship between Clark and Pete. According to Verheiden, they wanted a moment where Pete could release his feelings to Clark, and the jealousy he has over Clark spending more time with Lex and Lana. The episode featured the moment when the friendship between Clark and Pete "fractured a bit". "Obsession" featured a scene first thought up in season two's "Visage", which called for the use of lead paint to block the effects of kryptonite on Clark when Tina Greer trapped him in the storm cellar with Lana's kryptonite necklace. The scene was rewritten to have Clark's spaceship save him, and used later in "Obsession", where Clark and Chloe use lead paint to trap the teleporting Alicia Baker.