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.
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.