At the beginning of this episode, Gwen complains that she only got to be Lucky Girl for a few hours. The events of "Lucky Girl" don't reflect this, though. She first received the charm at a time when it was light out. When she stopped a group of pursesnatchers, it was nighttime. She first wore her outfit when rescuing construction workers early in the morning. And during the haunted house sequence, it was nighttime again. She must have had her powers for more than a day.