please, tell me all these hints. I cant remember a single obvious one.
There was only one conversation where they mentioned something about a targaryen sleeping with neds sister. They didn't even mention there was a child in that conversation.
Since you asked so nicely...
-They've mentioned Lyanna Stark numerous times this season with one of the big ones being Sansa visiting her tomb with Littlefinger discussing the tournament where Rhaegar picked Lyanna over his own wife which meant he loved her, but then Sansa recounted the story they were told about Lyanna being kidnapped and raped by Rhaegar the same season where Barristan explained to Dany how nice he was and how he loved to sing to the people, etc. which is meant to be in stark contrast (had to do the pun) to the reputation he has as some evil rapist but we all know the victors write the history.
-Stannis mentioned that it wasn't Ned Stark's way in response to someone calling Jon a bastard and we all know from season 1 that Ned was too honorable to do something like that since he loved his family. So what's more honorable than taking the heat from his wife and others to protect his nephew from Robert and every other person that would have killed Jon?
-Melisandre tried to seduce Jon Snow which she has only done to other people that had royal blood in them like Stannis and Gendry and she even said that their union would have the power to make life or light, or to cast shadows just like what she did with Stannis which once again required royalty... So why the sudden interest in a bastard Stark? She's made a few comments about Jon being special and she clearly sees something in him and now she shows up just as this shit happens?
-Melisandre also said this to Stannis in an earlier season:
"You will betray the men serving you, you will betray your family, you will betray everything you once held dear... and it will all be worth it, because you are the Son of Fire, you are the Warrior of Light."
Yet she abandoned Stannis (coincidentally shortly after meeting Jon and trying to seduce him) and went right back to Castle Black as Jon is being killed by that bitch Olly. The prophecy seems to fit Jon here more than anyone else because he'll betray the men serving him (after they betrayed him and killed him basically), he'll go off to do bigger and better things which might mean not coming to the aid of his family, and he'll break the oath that he tried to value above everything else, yet it will be worth it because he's the so-called chosen one. The Son of Fire would also make sense for a Targaryen son.
-In the previous season, Oberyn mentioned Rhaegar leaving his wife for another woman as well.
They talked about Lyanna AND Rhaegar more in this season than every other season combined and there's no way it's filler in a show this condensed. This show has always done a lot of foreshadowing, just like with the Lannisters last season. This show still follows typical story conventions despite breaking a few with previous deaths and events.