When Prue & Andy meet to discuss the premonition the tree in the background has the triquetra symbol carved in it.
During season 1, the Charmed Ones and their associates vanquish eight warlocks, fourteen demons, one ghost, one darklighter, one wendigo, one lord of war and two mortals - a total of 28 evil beings.
In the last scene the door of Halliwell Manor is closed (magically by Prue) starting a season ending tradition. In the pilot, the last scene is also a shot of Prue closing the door in this same way.
Newsperson Nancy O'Dell later returns in the season 5 "A Witch's Tail" when she interviews Phoebe in the bathtub.
The episode title is a reference to a quote attributed to Yogi Berra: "It's like déjà vu all over again."