This is so far the best episode! I love it! Well done. Superb!!
I especially love how tied in the different time periods through the video while it is also happening at the same time, and the two Henry's switched places.
There's the "fight" time period. Then there's the far future. Then there is the present. While they also revealed how future Henry sang with exact same song with young Clare.
For a time travel story, and a show especially in this case, such connecting scenes are easily not thought of. For the director and writer to have thought something like this, it speaks volume to how much they spent time to perfect this episode.