Claim: "The Butterfly Effect Part 2" was episode 2 in season 4, and it aired on October 16, 2009.
Evidence: It is the second episode from Season 4, the 67th episode overall, and the conclusion to a two-part episode. "The Butterfly Effect Part 2" is an episode from the dramedy series Ugly Betty, which aired on October 16, 2009. 
Season 4
Episode 2 October 16, 2009