During the exchange between Angel and Harmony near the beginning of the episode, Angel says that he doesn't recall what it is like to be human. Technically, he should remember, as he was human back in Season One's "I Will Remember You".
During the altercation with Angel at the beginning, Wesley picks up a shotgun. Its a different model to the one that he dropped at the end of episode 21.
During Angel's chat with Connor, Angel says he was at the first taping of The Carol Burnett Show (1967) and says, Tim Conway was on fire." Tim Conway was in only one episode (4th) of the 1st season of the Carol Burnett Show; he became a regular part of the show in season 8.