The incidents that Tucker mentions in his interview with Benson refer to the following episodes, in chronological order: Risk (2003) (S4E12), Coerced (2003) (S5E06), Serendipity (2003) (S5E05), Demons (2005) (S7E01), and Ripped (2005) (S7E04).
Characters repeat "This changes everything" threes times during the episode.