Normal for full blood labs?

Mine and my BFs new puppy Harmony is a full Black lab, we picked her out because of the knot on her crown (bird dog and other hunting dog trainers say it's a sign of being exceptionally smart) and some quirks of hers. She was the only puppy in a litter of 12 black labs that had white on her chest and back paws, brown behind her ears, and a curly tail that touches her back. (like a Akita, Shiba Inu, or besinji) I'm wondering if it's normal? I've done a little research and came up with a explanation for the white, it could be "throwback genes" meaning it has recessive genes from the labrador ancestor called The St. Johns Dog, but I'm not sure if the curly tail would be a part of that. She uncurls it when she's relaxed, asleep, or afraid but curls it tighter when she's happy or excited.