Thank You for Not Morphing - S1-E3
Continuity mistake: When Prue tells Victor to leave the auction house, Victor has his arms behind his back, but in the next shot, his arms are in front of him. (00:09:40)
Thank You for Not Morphing - S1-E3
Visible crew/equipment: In the scene where Prue comes home and finds Andy inside the manor. There is a shot where if you look behind Andy's shoulder you can see half of the body of the director in the background in the observatory room sitting in a director's chair. (00:16:00)
Thank You for Not Morphing - S1-E3
Continuity mistake: In this episode one of the shape shifting demons from across the street attempted to take the book of shadows out of the house. He managed to carry the book to the door, but could not take it past the threshold of the house. But in the later series it is always stated that evil cannot touch the book of shadows.
Thank You for Not Morphing - S1-E3
Factual error: At the end of the episode the girls are waiting for Victor. He doesn't show up but sends a package containing a home movie. As they are watching it, they see Christmas when they are little girls. Phoebe can't be more than 4 yrs old, 5 at the most. Since she was born in 1975 that would make the home movie take place in approx 1980, but she gets a Wedding Day Barbie, which didn't come out until 1996.
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.