I never thought for a second that the blonde annoying neighbor was Allison's monitor. She was so convinced that it was I knew it was a red herring and it was going to be the husband all along.
I'm extremely disappointed that Helena was killed off (yes I realize that may not be the case, but for now I will assume she is) as she was my favorite Tatiana character besides Sarah. I am intrigued about this Rachel character though, it seems we exchanged one evil clone for another, will be interesting to see what her story is next season.
I remembered something that Guy said weeks ago, and almost thought that Helena would kill of Sarah in tonight's episode, then next season we'd be following another clone. That would be bold storytelling right there. But it won't happen as this really is Sarah's story.