Continuity: 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.

Continuity: You'll notice in some episodes (like "Coyote Piper") that when the sisters look out of the attic window, they can see Prescott Street below, indicating that the attic window is on the front of the house. But if you look at the size and shape of this window, you'll see that there is no window like this on the outside front of the house. In addition, in "Sin Francisco," Phoebe looks out the attic window and sees the front porch from a side view. There's no structure on that side of the house to begin with.

Plot hole: In episode 1-2 ("I've Got You Under My Skin"), Alec buys Phoebe a martini at Quake. but then in episode 5-11 ("The Importance of Being Phoebe"), Cole tells Kaya that Phoebe doesn't drink. Then, in episode 5-17 ("Lucky Charmed"), Jason buys Phoebe a "Martini, Dirty" at the end.

Revealing: Throughout the series, Finola Hughes appeared as Patty, the deceased mother of the Charmed Ones. Although Patty died in 1978, she sometimes appeared in flashbacks and time-travel episodes that took place in the mid to late 1970s, and other times she appeared as a ghost. However, over the eight years of the series, Finola Hughes aged noticeably. Patty was born in 1950, so she should always have been either a young woman in her mid 20s, or an unaging ghost having died at 28.

Plot hole: In episode 1-3, 'Thank You For Not Morphing', when talking about their father, Phoebe says "He sent us birthday cards." But after that episode they made a number of references to the fact that he never sent them birthday cards, like when Piper tries to convince the others to sign Victor's card in episode 2-19.

Continuity: In Sight Unseen, we can cleary see Cole turn the air conditioning very cold and open all the windows so that the Prue, Piper and Phoebe can see the invisible demon, but in Oh My Goddess (1) Phoebe asks Piper why they have never invested in air conditioning.

Factual error: Considering how the sisters and Cole every now and then - especially during seasons 3-5 - find themselves in some churchyard or cemetery, it should be noted that there are no such places in San Francisco! Except for the original one at an old nunnery, from before the city was founded, and the Presidio Military Churchyard, all graves were moved in the first half of the 20th Century to the cemeteries at Colma, a few miles south of SF. This was done due to the sanitary risks in case of earthquakes, and the lack of space for churchyards downtown.

Plot hole: When Phoebe first discovered that Leo was an angel and he had come back to help Max, this episode implies that he can only help new witches who are discovering their power, but he stayed with the charmed ones for years.