Corrected entry: Phoebe says to Paige that she didn't know that Kit was their familiar, that she was just some cat that kept hanging around on the porch. But they learned that Kit was their familiar in episode 3-17 'Pre-Witched', and they also said that Kit is male, unlike the woman in this episode.
Corrected entry: In episode 3-9: "Coyote Piper," Piper danced sexily on the bar while the song "Unbelievable" played. She danced only to the one song before her sisters pulled her off the bar. In this episode, Phoebe and Paige physically enter Piper's memory (magically enhanced for accuracy), and a different song plays during Piper's dance, despite it being the exact same video footage. (00:33:35)
Correction: The reason why the music is different when Piper is dancing on top of the bar in the memory of the episode "Cat House" is because once the series had ended, any music that was used during the course of the series the license had ended and could no longer be used, with the future reproduction of DVDs of the series. All music that was used including the theme song was replaced, all with the exception of the scenes of the many different bands that performed at P3, which were kept and along with the show's outro music, which was composed by the show production staff Jay Gruska. Any TV networks that air the show will still have the original music, but other video media platforms such as Netflix, will have the new changes to it.
Thanks for the information, but in this case, if true, it proves that the change was made in episode 5-8 as aired on TV, because I saw music other than "Unbelievable" on television, in syndication on TNT, rather than on a platform. The reason I noticed the difference was that I watched the two episodes close together in time, both on TNT.
Corrected entry: When Phoebe and Paige are in Piper's memory of her wedding, the warlock steps on the cake topper, crushing it. Piper feels a pain in her heart, and it shows it disappearing in the future, leading you to believe that it will have some significance. Yet, it is never brought up again in the series.
Correction: It foreshadows the couple's marriage falling apart next season.
Correction: They did not learn that Kit was their familiar in "Pre-Witched." The idea of familiars was introduced that episode, but they never explicitly stated that Kit was theirs. It may have been hinted towards the audience the way the cat always hung around them and such, but no one ever actually told the girls' that Kit was their familiar. Granted, you'd think they would've suspected it being witches and all, but since it wasn't actually stated until "Cat House" I would not consider it a plot hole/error. They did call Kit a boy though, and not just in that episode, so the fact that Kit turns into a woman when revealed as their familiar is certainly an error.