Something Wicca This Way Goes - S7-E22
Continuity mistake: Phoebe's shoes change between shots. Near the end, while fighting Zankou in the basement, he hurls the sisters to the ground and Phoebe is shown wearing sandals. When she stands up, she is now wearing sneakers.
Something Wicca This Way Goes - S7-E22
Continuity mistake: Tim's eyes keeps changing from opened to closed at the morgue with Zankou.
Something Wicca This Way Goes - S7-E22
Continuity mistake: The hole where the demon throws an energy ball through the roof is gone when the doors close.
Something Wicca This Way Goes - S7-E22
Continuity mistake: When Zankou is looking at the spell in the Book to steal TCO powers we see that it is the same spell Aunt Gail used in "How to Make a Quilt out of Americans", except that in that episode she ripped the page out of the book. It shouldn't be there for Zankou to use. (00:09:56)
Something Wicca This Way Goes - S7-E22
Visible crew/equipment: When Agent Keyes enters the manor and walks into the kitchen, just as the hazmat team tells Keyes it's OK to breathe the air, the red tape mark is visible on the floor in front of Keyes' feet. (00:37:00)
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.