Pre-Witched - S3-E17
Plot hole: One of the sisters asks why the familiar doesn't just jump in front of a bus 5 times, another responds with "we're the only ones strong enough to kill him." If they are the only ones strong enough to kill him, then how come two scenes later he falls on a knife during a fight with Phoebe and dies? If a knife can kill him then it doesn't make sense that he seeks out the charmed ones.
Continuity mistake: When the Charmed Ones' father, Victor, came to San Francisco in episode 1-3: "Thank You for Not Morphing," his last name was Halliwell. But when he came back in the third season and later, his last name was Bennett.
Magic Hour - S3-E2
Continuity mistake: In this episode, Phoebe says "Grams, you were married four times." But in "Lost and Bound," Phoebe tells Cole that Grams was married six times.
Continuity mistake: When Prue was talking with the shut-in and the security guard comes up and knocks on the door you can see the the chain is on the door. When he knocks again and says he is coming in and tries to open the door the chain is off.
Plot hole: When Phoebe and Cole are using the apple peel to find out her true love how does she not recognize that it is Cole? Even with the mask it's very clear that it is him.
Suggested correction: I was thinking the same, but it's possible she thought he was an ancestor/past life of Cole. When she visited her own past life, she recognized everyone there because of their "souls" so maybe she thought the same with him. Although you'd think they'd acknowledge that a little.
Audio problem: When Prue is at the dentist, she grabs a guy and he says, "What, what did I do?" to his girlfriend, but his lips do not move.
Continuity mistake: The timeline in the episode is inconsistent. Right after the first courtroom scene, we see the three sisters at home, and Phoebe says that "Cole was an angel in that courtroom yesterday." Later, Cole says that he regrets the criminal being let go, "today." But they are talking about the same events.
Visible crew/equipment: At the start of the final courtroom scene, when the first shot is on Cole with Morris behind him, the boom mic is visible over Cole at the top of the screen. (00:34:25)
Sleuthing With the Enemy - S3-E8
Revealing mistake: When Cole / Belthazar grabs Phoebe to use her as a hostage, you can see, very obviously, that he doesn't pull her. Phoebe actually steps in front of him willingly, despite the look of fear on her face.
We All Scream for Ice Cream - S3-E10
Visible crew/equipment: When Prue and Phoebe are trying to pull the girl out of the ice-cream truck, in one brief shot, you can see the wires holding the girl up.
Continuity mistake: When Cole catches Phoebe's karate kick at her school, her foot is up near Cole's shoulder, but then moves down much lower. (00:18:20)
Sleuthing With the Enemy - S3-E8
Revealing mistake: When Phoebe throws the potion at Cole's coat, the vial doesn't shatter, even though it sounds like it. Watch closely, and you'll see the purple, unbroken vial bounce off the coat and away out of shot without any of the potion touching the coat.
Continuity mistake: When Prue talks to Piper after stopping her phone conversation, she tells her that "the Sin Balls work a lot faster than [they] thought. Once infected, the victim only has a few hours before it drives them to total self-destruction." However, this is almost verbatim what was written in the Book of Shadows. It could be easily read by the viewing audience when the book entry was shown. So all three sisters should already know this.
Continuity mistake: When Kate was drawing the trolls in one shot she had a peach coloured crayon, and in the next shot she had a purple crayon.
Coyote Piper - S3-E9
Revealing mistake: Prue knocked Piper unconscious in the cat fight (after the Coyote Dance), and asked Justin to carry her to the car. But when he is apparently lifting Piper up from the floor, you see Piper standing up by herself.
Revealing mistake: At the end when Prue is fighting the demon you can tell she is holding on to her safety harness when she is in the air kicking him.
Power Outage - S3-E7
Revealing mistake: When Astral Prue kicks Leo/Balthazar in the face during the training drill near the start of the episode, her foot misses his face yet he still reacts as if hit.
Magic Hour - S3-E2
Revealing mistake: In the attic when the sisters are talking about the "rutabaga," some of the shots of Piper are reversed, her "broken" eyebrow is on the wrong side.
Continuity mistake: Piper says she wants to go to Paris by plane not by orbing, but in the episode "From Fear to Eternity" flying was Piper's greatest fear.
Revealing mistake: When Prue is practising using her powers while astral projecting, when Phoebe walks away to go see her in the attack you can see the makeup they used in an attempt to hide her tattoo on the right side of her back. It looks as though she's been bruised there. (00:00:43)