There is no such thing as mistakes, only opportunities for improvement. For a first video, it was really good. Let me give you some of the principles behind my suggestions.
I tend to like magic that has less movement and flair. I'm influenced a lot by Roberto Giobbi. Try the effect with just using the first turnover and regular deal. As a magician, you feel incomplete, like it is too easy. For the spectators, it is more magical because you are doing less. The focus is on the effect, not the movement of the cards. The problem with that is the repetition can expose methods (although I think the method here is strong enough that the spectators won't figure it out). That is what lead me to suggest the different handling of the turnovers / insertions but similar handling of the lay-downs.
I think that magic should have an internal consistency. How does the effect magically happen? Often the spoken script gives some idea of this, but the moves also should give some idea. I think your cupping the cards was an attempt at this. However, it seemed to remove the cards from view and was a "closed" action rather than an "open" action. "Closed" actions raise suspicion (think taking a deck behind your back). The tapping of the cards on the packet with the Ace of Spades gave that internal logic - "when I tap the cards, they change places" while also setting up the final reveal. You want the spectators to "want" the magic to happen and providing an internal consistency helps generate their interest.
It is hard to forget that you know the method. Magicians often try very hard to disprove the method when, for a regular audience the audience has no clue. When you disprove a method, do it in a subtle manner. Just showing the back of a packet once is enough to convince the audience. Showing it four times (and the display for the third lay-down), is telegraphing you have something to hide.
I was thinking about this and decided that a better way is to deal the cards face down and then turn the Ace of Spades face up followed by the other cards. This builds the excitement a little more.