In "Amends" the First Evil says to Angel, that sooner or later he will drink Buffy's blood. He does so in "Graduation Day: Part 2"
Doyle mentions Angel drinking Buffy's blood, also leaving her after the final battle - both seen in "Graduation Day: Part 2"
Angel's departure from Sunnydale and him helping in saving the world "a couple of times" is mentioned.
Angel mentions the last he heard of Faith was that she was in a coma. That occured in "Graduation Day" when Angel was still in Sunnydale
Angel mentions that he helped to defeat the Mayor.
A clip from this episode is shown.