HERE is the Amazon Prime UK link to where I watched the episode (I'm sure it's the same video on the US site). If you don't have a subscription there then hopefully you won't have any issues syncing your episode with mine. I play the first few seconds of video/audio to help. The most accurate way is probably to watch my eyes change direction with each camera shot change.
Instructions - How this 'watch along' reaction works (ignore what I say in the last 3rd of that video).
That was a fun one with a good twist, if a little confusing with all the shapeshifting going on! I was convinced that wasn't her real dad, even up to the dramatic finale. I guess it's hard to trust someone when there's a possibilty that they aren't who they say they are, haha.