Apart from the poor attempt at staking the castle nut, the rest of the things you listed are normal for a new AR15 that has been test fired for function at the factory.
Ignore the people that say it doesn't need to be staked, they don't know what they are talking about. Castle nuts can and do come loose, and can lead to malfunctions and parts breakage. Also, never loctite a castle nut, it is harder to get off than staking. Staking can be easily broken using a proper castle nut wrench when you want to change out anything.
If the staking on one of the other two points is the same, or not staked at all, then stake it before shooting it, although you should probably stake it properly anyway. It should look like this:
It is easy to do with either an automatic center punch, or a punch and hammer. A couple of hits should do it. It can then be touched up with some matching black paint if you like.
I would also check the staking on the gas key, which should look something like this:
Keep the carbine lubed with a good lube. We use Slip2000.
The carbine is also more than likely overgassed, so if using 5.56 ammunition, you might want to invest in a H or even an H2 buffer, it should be fine with a carbine buffer and .223 ammunition.
Just as importantly, don't be in a hurry to rush out and buy and accessories for it. All you need right now, is a few more magazines, and 1000 rounds of ammunition. After that, if there is something about the gun you don't like, such as the grip, stock, etc. then if possible, try one on a buddies gun first.
Regards.
Mark