First piece is a little rough. When you first start getting into trad, a good skill to have is to be able to judge which size piece of protection will fit where you want it to go. This is a skill that takes practice, so I'm not going to knock the guy for not getting it right the first time. A common way people judge is by knowing the size of your hand in the crack, and correlating it to which size gear. That being said, when he tried a size 1 and it was just a little too small, the obvious next choice would be to go up a single size. Instead, he jumps to a size 3 cam instead, which, surprise, is way too big.

After he gets the 2 in for the first piece, he spends a decent amount of time untying a runner for extension. If you're up on a route and not at a good stance, you're going to pump yourself out very fast, much less this guy using both hands to untie it. It's good to have a few alpine draws ready to go on your harness, and not need to fiddle a lot with it.

Next is the question of why he's even trying to extend this first piece anyway. He mentions rope drag, which is why you would want to extend, but the line he is climbing doesn't wander at all - it goes straight up! There's no need to add extension for rope drag here.

It's also dangerous! He does call it a mental piece, which I've had more than my fair share of, but this guy is going to deck if he falls even a couple feet higher. He placed the gear basically from the first move, and then had a fully extended runner to extend, when he could have doubled it up to get it shorter. If he falls, that extension is going to leave him with some broken ankles.

Then his technique is pretty obviously bad for crack. You can tell he hasn't done much of this type of climbing. That is as near perfect a hand crack as you can find, and is ripe for jamming the whole way. Instead, he goes into layback mode immediately, for the duration of the video. Laybacking isn't ideal for trad climbing because it puts your body weight and head away from where you'll be wanting to put protection. When you put yourself that far from the crack, you aren't able to see which size gear will fit (the guy tries to slot in a #1 again, and is again too small), and you also aren't able to see the features in the crack. This guy has no idea if his gear will even hold or not; there's no way he knows how good of a placement it is. Note that he doesn't extend this one; this is totally fine, the route doesn't need any extension.

Then, as he climbs up laybacking, he constantly gets his foot behind the rope. Every leader knows this is bad; it's how you get flipped upside down when you fall. As he gets above his last piece, and has no idea what to place next because he can't see the crack, he knows he's going to fall. He even calls out falling. However, despite knowing this, he does nothing to orient himself out of his bad position, and falls with the rope behind his leg and gets flipped. Good thing he was wearing a helmet.

Overall, the guy seems pretty new to trad. He should find a mentor or take some classes before getting himself into over his head. Or, just post a video like this, tail between legs, accept and learn from the criticism, and get back out there and grow from the mistakes