Mysteries of the Fandoms

There are probably countless mysteries of the fandoms, but these are two I noticed/remembered. These are things we will be wondering for years. We probably will never find out. And that, my friends, is really depressing. But here they are. Don't read on if you haven't read Harry Potter and the Deathly Hallows or Mockingjay.
What did Aunt Petunia want to say to Harry? Guys, on page forty-two of Harry Potter and the Deathly Hallows, it says, "She stopped and looked back. For a moment Harry had the strangest feeling that she wanted to say something to him: She gave him an odd, tremulous look and seemed to teeter on the edge of speech, but then, with a little jerk of her head, she bustled out of the room after her husband and son." And that's the end of the chapter. That's the last time we see Aunt Petunia ever, in fact. And we could just follow all our characters for the rest of their lives, but writers know that you write enough to get the story told and that's it, and once the story is told, it's told, and the story is done. So sadly, we don't know if Harry ever saw Aunt Petunia again. And obviously mysteries like that that are not shown to us are endless and we could wonder about them day and night, but that's not the point right now. What did Aunt Petunia want to say to Harry? Could it be along the lines of the deleted scene from the Harry Potter and the Deathly Hallows Part One movie? I don't think so, because Petunia really didn't miss her sister, I don't think. I don't know. It's complicated. Read "Vernon & Petunia Dursley" on Pottermore in "The Cupboard Under the Stairs" in the first book. It kind of shows how that doesn't really seem likely. I don't know what she wanted to say. Maybe she really did love him all this time? It could be. It could be anything. What did she want to say? Ugh.
What are the names of Finnick and Annie's and Peeta and Katniss's children? Dang, doesn't this one just kill you? All the fangirls of both Hunger Games and Harry Potter are sitting here saying, "J.K. Rowling gave us their children's names. Come on, Suzanne Collins. It was the least you could do."  Some of us don't think she went into enough detail of how things happened at the end of Mockingjay at all. There's so much she didn't tell us. She just told us that Katniss and her fellow victors learn to live again and she and Peeta end up together and have a family. That's all? Of course, the fangirls will always want more, but we need to know their names. Finnick and Annie's was a boy, so I thought they might name it after Mags until I remembered they had a son. As for Katniss and Peeta, I thought maybe they would want to name their daughter after Prim. I've heard some people say that maybe they named their son after Katniss's father. Or maybe they all came up with original names. But that's the thing. We don't know. And we'll be wondering about it for the rest of our lives.
Thanks, though, Rick Riordan. You're still giving us more. Heck, you're writing a whole other series for us with one book still to come. Thanks, Rick. We owe you one.
Do you have any leads on these mysteries? Any personal theories? Any other mysteries that drive you crazy? Comment! I would love to know!