The Power of Three Blondes - S6-E4
Continuity mistake: The Stillman sisters strip the Charmed Ones' powers by using the same spell as Aunt Gail did in Season 2 (How to Make a Quilt out of Americans). But in that episode the Charmed Ones had to first drink a potion and Aunt Gail needed to wait a certain amount of time (at least 30 minutes) before the spell worked. In The Power of Three Blondes, the Charmed Ones never drank a potion and lost their powers before the Stillman sisters even finished the spell.
The Power of Three Blondes - S6-E4
Continuity mistake: When Phoebe kicks Mabel after the Stillman sisters have taken the Charmed Ones' powers, Jennifer Sky's stunt double's face can be plainly seen, and also her hair is darker and less full.
The Power of Three Blondes - S6-E4
Continuity mistake: During the scene when Paige goes to the citrus plant during the labor rally, her pink blouse is quite short, baring her entire midriff. When the security guard throws Paige out of the plant, Rose McGowan's stunt double is wearing a shirt in the same pink color, but it reaches all the way down to her waistline.
The Power of Three Blondes - S6-E4
Plot hole: Paige sees Margo leading the labor rally at the citrus factory, and then is stopped by a security guard. In the next scene, Margo and her sisters are entering the manor, and then after that Paige is thrown out of the factory. But how did Margo get from the factory to the manor before Paige was thrown out, when she was in the middle of the rally?
The Power of Three Blondes - S6-E4
Continuity mistake: When the Stilman sisters are talking about who gets which powers, Margo(the youngest)had her hand by her side, but in the next shot when she talks about Mitzy's (the middle sister) attitude, she has her hand on her shoulder.
The Power of Three Blondes - S6-E4
Revealing mistake: When Phoebe is thrown out of the Bay Mirror office by a security guard, Alyssa Milano's stunt double's face is digitally blurred.
The Power of Three Blondes - S6-E4
Continuity mistake: When Phoebe gets a phone call from Elise, Phoebe's phone changes back and forth from her right ear in the wide shots to her left ear in the closeups. (00:18:45)
Answer: "Hush, Hush, Hush" Paula Cole.