A Paige from the Past - S4-E10
Other mistake: When Piper and Leo are talking to Phoebe about Phoebe's fear of accepting Cole's marriage proposal, Piper comments "...even though he could rip your throat out with his teeth", but the closed captions mistakenly read "with is teeth." (00:05:05)
The Importance of Being Phoebe - S5-E11
Continuity mistake: When Phoebe is lying on the ground and is supposed to be unconscious, when Cole goes to pick her up you can see Phoebe throw her arms around his neck. (00:29:15)
Trivia: Holly Marie Combs's real life pregnancy with her son Finley Arthur Donoho was mirrored by Piper's pregnancy with Chris in this season.
Answer: "Hush, Hush, Hush" Paula Cole.