I wondered about this too. The Millie in s5 I could see, because she seemed like a girl who wanted kids a bit older in life and wanted to have a 'career' first. But now she has one, she has her own show, and she had been with Mouth practically 4 years prior. Maybe they just wanted us to see Millie pregnant at some point, she was very cute pregnant, but it wouldve made more sense logically for her to have a child (I hope a girl) pointed out and maybe have Bevin be the pregnant one or maybe even Quinn.
I also agree with what a lot of you said about LP. I think they should definitely have been mentioned more, especially Peyton. Lucas was alright because we did see Haley with the Julius Ceasar book, and the predictions box (I also would have liked to see Haley keep a copy of an Unkindness of Ravens in the cafe too). But with Peyton, we basically got nothing other than seeing her old room. I would have liked to see maybe Brooke telling Julian some stories of times with her and Peyton in Peyton's bedroom, or something. And it would have been even more amazing for Haley/Nathan or Brooke to mention that LP are moving back to Tree Hill (EVEN in the flashfoward).