Minato (the 4th) secretly trained with Orochimaru when he was a teenager; Jiraya didn’t know about it.
Sai is related to the Uchiha Clan.
Sai’s brother isn’t really his brother & he was used as an experiment by Orochimaru & was killed by Kabuto. Sai blames himself for his death & that’s why he didn’t deny “killing his brother” when Sakura confronts him about the book.
Shikamaru & Temari are lovers.
Ino & Choji get together.
And Naruto & Sakura are crazy in love…..there’s supposedly a minor sex scene towards the end of Shippuden (no nude scenes though)
There's a big ninja war.
Lee dies in Gai-Sensei’s arms after some battle.
Ino dies saving Sakura.
Hinata dies trying to be brave like Sakura (She admires how Sakura changed & became strong) Neji and Kiba are there when it happens but they were injured. Neji said it was his “duty” to protect Hinata, but Hinata wouldn’t accept that. She managed to kill the enemy. (one of the Akatsuki, I think)
Rin is Tsunade’s daughter (Tsunade was pregnant from Dan when he died).
Rin is working under Pein now as a medical ninja.
Rin witnessed the Uchiha murders & was taken captive by Madara. Kakashi & everyone else thought she was dead. (Kakashi & Rin were 17 @ the time)
Madara absorbed Obito’s right-eye Sharingan & used it to create a new kind of Mangekyo Sharingan. (That’s why the hole in his mask is on the right side) But Obito is dead.
There are more people who join Akatsuki after some of them die.
Sasuke takes Itachi’s old position in Akatsuki.
Sakura is captured by the Akatsuki at the end of Shippuden and works under Rin, not knowing who she is.
Tsunade believes that Sakura is dead & has a funeral for her.
Naruto runs away to rescue Sakura because he doesn't believe that she died in the war because her body was never found.
There’s another Naruto series after Shippuden, when they are adults.
Gaara dies (long after Chiyo brought him back).
Sasuke goes back at the very end of the saga to save Naruto in the battle against Madara and Sasuke dies in that battle.
Pein is the 4th Hokage. He controls several different bodies & “Pein” is just one of them. Madara is actually the founder of Akatsuki & he’s the only one who knows that Pein is the 4th. None of the other Akatsuki knew this, except Rin knows….but she’s not an actual member of Akatsuki….she just works for them.
“Pein” is killed, but he switches to another body. Rin & Kakashi both died. They were reunited at the end & Rin decided to risk her life and fight against Pein….which is how “Pein” died. Rin & Kakashi were in love when they were teenagers.
Tsunade dies while fighting the new Pein (different body) & finds out who he is because Minato shows himself right before he kills her….the 4th is very very evil!!
Jiraya dies long before this & had no idea that Minato was still alive.
Naruto's last battle is with his father (the 4th) & the 4th succeeds in taking the Kyuubi out of Naruto, but Sakura is able to save Naruto’s life somehow while injuring herself, but she lives.
Naruto defeats the 4th with the help of a few others (don’t know who). (This battle is supposed to drag on forever.)
He later leads the Konoha ninja in battle against Kyuubi. They send it back to the underworld & Naruto meets up with Jiraya in some place between worlds where Jiraya helps him seal the Kyuubi back into the underworld. (places a seal on both sides of the gate) & then the war is over. Naruto becomes Hokage & no longer has Kyuubi & the lines on his face disappeared.