To see an outtakes reel from season four, press L(2), R(2), Up, X(2) at the start screen, then find Spike in the Downtown Sunnydale level.
At the start screen, press Up(2), L, R(3) to see the demon Sweet from the episode "Once More With Feeling".
Successfully complete level 12 with any rank.
Successfully complete level 5 with any rank.
Successfully complete level 2 with a "Slayer" rank.
Successfully complete level 8 with a "Slayer" rank.
Successfully complete level 11 with a "Slayer" rank.
Successfully complete level 10 with a "Professional" rank.
Successfully complete level 4 with a "Professional" rank.
Successfully complete level 10 with a "Slayer" rank.
Successfully complete level 12 with a "Slayer" rank.
Successfully complete level 8 with a "Professional" rank.
Successfully complete level 1 with a "Slayer" rank.
Successfully complete level 12 with a "Professional" rank.
Successfully complete level 9 with a "Slayer" rank.
Successfully complete level 1 with a "Professional" rank.
Successfully complete level 5 with a "Professional" rank.
Successfully complete level 6 with a "Professional" rank.
Successfully complete level 7 with a "Slayer" rank.
Successfully complete level 7 with a "Professional" rank.
Successfully complete level 6 with a "Slayer" rank.
Successfully complete level 3 with a "Slayer" rank.
Successfully complete level 3 with a "Professional" rank.
Successfully complete level 4 with a "Slayer" rank.
Successfully complete level 11 with a "Professional" rank.
Successfully complete level 2 with a "Professional" rank.
Successfully complete level 9 with a "Professional" rank.
Successfully complete level 2 with any rank.
Successfully complete level 1 with any rank.
Successfully complete level 3 with any rank.
Successfully complete level 8 with any rank.
Successfully complete level 7 with any rank.
Successfully complete level 6 with any rank.
Successfully complete level 11 with any rank.
Successfully complete level 9 with any rank.
Successfully complete level 4 with any rank.
Successfully complete level 10 with any rank.