During Charlotte's ramblings after she collapses in the jungle, she mentions the band Geronimo Jackson - the same band whose album Hurley found when they first got into the Hatch in Season 2, and whose t-shirt Eddie was wearing during one of Locke's flashbacks in Season 3 (ep 13). We also saw a Geronimo Jackson poster in a flashback to John Locke being trapped in his locker at school.