Tracker jacker venom is used to associate fear with certain memories, and to alter those memories with hallucinations. It is difficult, but not impossible, to fully cure. It was most notably used on Peeta Mellark during the rebellion in Mockingjay.
How were Peeta and Johanna tortured in the Capitol?
Peeta, Johanna, and possibly Annie were held in adjacent cells. As part of their torture, they were forced to listen to each other's screams. Johanna was starved, beaten, had her head shaven, and she was soaked with water and tortured with electric shocks. This caused her to develop a fear of water.
His feelings and memories are distorted with hallucinogenic tracker jacker venom, in a mind-control technique known as "Hijacking." The Capitol uses this method to turn Peeta against Katniss, making him believe that she is not only responsible for the death of his family, friends and the destruction of District 12, but ...
I did nothing to prepare physically for this role. I went on the CGI diet, computer-generated images. They just sucked my face down in post-production.
As she approaches him, Peeta wraps his hands around her neck and throws Katniss around the room. He begins to strangle her, nearly killing her. He is wild, unable to be stopped, at least until Boggs knocks him out with a metal tray.
The Hunger Games: Mockingjay - Part 1 (10/10) Movie CLIP - Reunited with Peeta (2014) HD
Why did Peeta call Katniss a mutt?
While a prisoner of the Capitol, Peeta was hijacked into believing that Katniss was not human, but in fact one of the Capitol's mutts. Conversely, Johanna Mason suggested that the Capitol's torture replaced Peeta with an "evil-mutt version" of himself. This sentiment was later echoed by Katniss.
Katniss here's this and understands that even though she may not love Peeta (then) that it's one less person who has to die. (At least that's what I have always thought.) Katniss realizes that if she pretends to be in love with Peeta people will want the capitol to let them survive.
For Peeta to look like he was tortured, many think he went on an extreme diet. But in reality, they used CGI to slim his face and make him look abused and beaten.
Given that she is willing to make the ultimate sacrifice to protect Peeta, it's safe to assume that the Morphling was committed to the rebel cause. Like the other victors, she knows the power that Katniss has as a lightning rod for the rebellion, and she knows that Katniss will not help without Peeta.
But Katniss also considers that Peeta shook his head at her at the Cornucopia, which may have been him watching out for her welfare, and that he didn't tell the Careers about her skill with a bow, preserving her advantage should she find one.
It took time for Peeta to break out of that conditioning, and even when the possibility existed that Peeta could be a danger to Katniss, the two of them still elected to be together and build a future in a post-Hunger-Games world. Their love for one another is evident.
Peeta, after weeks of treatment (he was presumably in the Capitol for about five to six weeks total), was still able to resist the effects. He warned Katniss Everdeen of the Capitol's plans to attack her, even though his memories about her had been hijacked. Only a short time later, his hijacking had been completed.
In Chapter 9, as Caesar Flickerman interviews Peeta before the Games, Peeta reveals to Caesar and all of Panem that he's in love with Katniss. Peeta's revelation sets in motion the storyline of him and Katniss as ill-fated lovers that carries on throughout the Games.
we also know he was beaten by peacekeepers after warning district 13 about the bombing, and that he'd lost weight and hadn't been sleeping properly. so it's possible that the capitol was starving him and depriving him of sleep on top of the hijacking.
In the case of Johanna, they each hated each other because that was what the Capitol had taught them to do. They were from competing Districts, and the idea of the Games was to keep the lesser citizens of Panem distrustful of one another and unwilling to form alliances (or raise arms in war).
Since Haymitch Abernathy's family was killed after his Games, and he mentioned Johanna's name when he spoke about being held up as an example to younger victors, it's commonly theorized that Johanna refused to be sex trafficked as Finnick had been, so her loved ones were killed in retaliation.
Chia Mags kisses Finnick on the mouth to briefly let him know that this is the last time she will see him. It's her way of saying "Goodbye" but in a more affectionate way.
The films, trying to be as faithful to the source material as possible, naturally had to include Finnick's death as well. In this sense, Finnick is the perfect candidate for upping the stakes of the plot via his death, as his hope for a future with his partner Annie made his demise seem even more untimely.
During the interviews for the 75th Hunger Games, Peeta lied about Katniss being pregnant to try to protect her from the Games, and Katniss later stated that she miscarried due to an electric shock in the arena to avoid further questioning.
Although Jennifer did dye her natural blonde hair for the first two film installments, she wore wigs for Mockingjay — Part 1 and Part 2 due to hair damage. Linda rented $30,000 worth of wigs — five wigs stamped at $6,000 each — ranging from light brown to dark brown, with a hint of red.
Why was Jennifer Lawrence wearing a wig in Mockingjay?
2. Jennifer Lawrence's Katniss Wig Was Stolen! The natural blonde had to wear a brunette wig in the final two installments of the franchise due to hair damage after dying her tresses for the first two films. It turned out that one of her castmates was all about Katniss' wig, too.
With the last killing occuring before an hour had even passed, these games shocked the Capitol audience and are the quickest in the history of the games.
While the Hunger Games film never talked about it, the Catching Fire novel explained why she could only communicate through hand gestures. Katniss briefly mentioned that a previous stroke could have caused Mags' garbled speech. However, post-traumatic stress disorder could have also caused her speech incapacity.
Katniss's focus on survival and her family's safety prevented her from fully considering romance, but her feelings for Peeta and Gale diverged in the end. Katniss ultimately chose Peeta because he understood her trauma and she didn't want to lose him, proving her love for him.
It's only implied that they get it on via snuggling and other affectionate acts in close quarters — but if you have read the book, they really imply that they took their relationship to the next level.
