Continuity mistake: When Phoebe goes to get her palm read, Madame Theresa draws lines on her hand. But when she first enters the room and sits down the lines are already visible on her hand, before they have been drawn there. (00:01:00)
Someone to Witch Over Me - S7-E7
Continuity mistake: In episode 7-7: "Someone to Witch Over Me," Piper is killed by the demon Sarpedon's metallic claw. When the claw strikes her, she falls back with her arms behind her, landing partially on her palms, allowing her to complete the fall by sinking gradually to the ground. Then there is a cut to a closer shot, and we see her fall again. The second time, she falls directly into a more prone position with her arms raised and the backs of both hands facing the ground.
The Importance of Being Phoebe - S5-E11
Continuity mistake: Paige's green top that covers her black t-shirt constantly changes from being on her shoulder to off, particularly in the police station scene. (00:11:10)
Continuity mistake: When Phoebe is walking the Dwarf to the door after finding out Piper pulled the sword from the stone, he steps outside and goes into fast-forward, then stops and goes back to normal speed as he sniffs a flower. During this, in the background, you can see Phoebe, who freezes the whole time. (00:18:40)
The Bare Witch Project - S7-E2
Continuity mistake: At the end of the episode it is not Alyssa riding the horse to the café. Alyssa has a tattoo on her right ankle, which when we see when camera pans up the right leg the person riding the horse has no tattoo on the right foot, but when Alyssa rides away you can see the tattoo she has going round her right ankle.
Continuity mistake: When the spider demon cocoons Piper, Paige throws a blue potion (the vanquishing potion) at her, Chris catches it and jumps over the couch, knocks Paige to the floor and Phoebe kicks Chris. The potion falls out of Chris hand and rolls into Paige's open hand, it has now turned yellow (the antidote) Paige grabs it as she stands and throws it at the spider demon again and it has now turned back into the blue potion.
Other mistake: If all the objects in the fortress are originals from the fairy tales, why are the ruby slippers red? In the original story the slippers were silver, they were made red for the MGM movie, so they would be the brightest thing on the screen.
Revealing mistake: As Phoebe and Rick are in the car about to do the robbery, she pulls out in front of the armoured van and as she drives out onto the road you see Phoebe's stunt doubles face.
Continuity mistake: Midway through the episode, the Seer is looking through the sisters' photo album. Several of the photos actually include everyone who was present for the events depicted, leaving nobody to take the photo. And since the events were shown in various episodes, we know that no photo was taken at those times by any automated method.
Revealing mistake: When Prue talks about her relationship with Justin near the beginning of the episode, she says that she finds him to be very predictable, lacking in mystery or "savoir-faire." That doesn't make sense, though, as "savoir-faire" means "know-how." She probably meant "je ne sais quoi," that is, "I know not what."
Continuity mistake: In this episode, Phoebe told Drake that she "can't believe it's been three weeks already", but Drake said in "Carpe Demon" that he only had two weeks to live.
Continuity mistake: When Chris orbs to the manor after Paige has returned home, his hair is brushed to lay mostly flat and behind his head, with a part on the left side of his scalp. When he comes into the kitchen shortly thereafter, his hair is shaggy and unkempt, with a part in the middle.
The Day The Magic Died - S5-E15
Continuity mistake: In the beginning, Paige is wearing a shirt with the scrunching sleeve on the right and slanting on the left. In following scenes, the scrunching sleeve is on the left and slanting on the right. (00:07:40)
Continuity mistake: When Paige is at P3, her mobile phone changes positions between shots.
Power Outage - S3-E7
Continuity mistake: During the training drill, Piper fumbles for a knife on a table in front of her. In the shot of the table, she loses hold of the knife as she pulls her hand up, but when we cut to a long shot, it is back in her hand.
Necromancing the Stone - S5-E21
Visible crew/equipment: When Piper hits the mirror after being thrown across the room by the energy bolt, look closely at the roof in the other room: a black rectangular hole with a stage light poking out of it is visible.
Revealing mistake: When Piper blows up the painting you can see the hole used to put the charge into to blow it up. (00:57:40)
Continuity mistake: Just after 'the Aggressor' tears the picture of the girls, they all change back to their normal clothes, however in one shot, Paige's arm is visible and she is still wearing her costume. (00:34:35)
Magic Hour - S3-E2
Continuity mistake: When Piper and Prue are talking to Brooke outside, Piper's arms change from being crossed to having her hands on her hips between shots.
Answer: That was a mistake in the series.
Also, the episode is called 'Babies First Demon' and this alone tells us that it's Wyatt's first time in the field (so to speak) and as the sisters say, they've done a good job of clearing up their own magical messes so far. Nobody really knows how advanced Wyatt's powers are, or will become. That's why the cleaners appear, to nip things in the bud. The Cleaners didn't want to chance that the sisters could clean Wyatt's magic up, just incase they couldn't. Therefore intervening themselves, just in case.