In this episode, Cole goes in to the manor and turns on the Air Conditioning to make it cold for Troxa, however, it is revealed during Oh My Goddess Part 1 that the manor does not have air conditioning.
When Abbey was in the basement with Prue she asked how she threw her through the door last night. There are two problems with this. First, "last night" was the night Prue vanquished Troxa, the night before that was when she threw Abbey. The other problem is that Abbey was at the club serving Sean drinks when Prue stood him up. Piper asked Prue if she was coming to the club to meet Sean and Prue made it seem like it was too far away, as she was almost home and halfway across town. There is no way Abbey could have served Sean, then made it to the manor to break all the mirrors and be waiting for Prue to get home.
When Prue looks at the mirror, you can see a crew reflection.
When Darryl calls to alert the sisters about having matched up the fingerprints found to Abbey, he tells them "You know, your bartender, the one from your list?" The lists they made out were lists of enemies and people with grudges against them. Up until now, the girls didn't know that Abbey was unhinged, and she was still working at the bar. She shouldn't have been on Piper's enemies list.
Prue says that she has been locking the attic door ever since a demon tried to steal the book of shadows, and is worried that the attic door was unlocked. If she was the only one who started locking the attic door, it could have been Piper, Phoebe, or Leo who left it unlocked.
Piper and Leo are making out and Piper says she can't have sex because she feels like the elders are watching. Leo says he should go check what the elders know about what happened at the manner. They kiss and while they are kissing, he orbs out. Later he tells Piper that they didn't call him because of him and Piper, it was unrelated. But the jingle for the elders calling Leo wasn't heard, he just orbed out.