At the beginning of the episode, Phoebe and Piper are preparing food in the kitchen. While Leo is talking to Phoebe, Phoebe pours something she has mixed together into a pie crust. Seconds later, when she goes to put the crust into the oven, the crust is empty.
The sisters and Zankou surprise attack the Avatars, knocking a few of them onto their backs which presumably renders them unconscious. A few moments later, after Zankou says "here, here", you can see that all of the Avatars are back in their original positions and no one is on the floor.
Brian Krause (Leo) is 5'8" tall. Oded Fehr (Zankou) is 6'1" tall. In most scenes their height difference is visible, yet when they are talking together in the cave the close-ups show them as being the same height.
When Kyle Brody comes back as a Whitelighter, it seems evident to both Kyle and Paige that this means they cannot continue their relationship at this point in time. No explanation is given for this. Assuming that it has to do with him being a Whitelighter, would take the accepted relationship of Piper and Leo back to at least questionable, if not forbidden again.