After watching the video 3 times, I can find only very small playing errors, yet there are valid reasons why they were correct plays on those situations:
1) At 0:25 with 21 cards NOT using Sundial. (Debatable since you ended up losing to deckout.)
2) At 1:15 instead of hitting spacebar you maybe should have used Basilisk Blood on your Doll. (Debatable since you were forced to give some target for spells Neptune had => give it double draws to get more damage on board.)
3) Drawing extra cards when you had 11, 9, 8 and 5 cards. (Debatable since after losing first Doll you had to get another.)