I have a theory for the jacket, I noticed that in the initial part of the movie where they make the reference to three gangs who fought for control of peach tree namely
Peyote Kings
Red Dragon
The Judged
Its shown through a bunch of sequences as Mama clan try to fight for control and the last gang they eliminate is shown to be The Judged and Mama is shown to take the jacket from the last member of the Judged clan who was shot in the back multiple times especially around the logo area. Judging from the way she looked at the jacket i would assume that it was the same jacket and there is a bunch of different logos been shown for all three gangs with the bullets taken into account at the back of the jacket. I think the clown logo could be an addition Mama added to that jacket or it could be the logo they were trying to base for themselves.
As for the other 2 questions I am trying to wrap my head around those but i was unable to find anything on the extras of blu-ray pertaining to it. I will edit this post further more when i find more add on this. The only thing i can think of right now is Anderson let go of the hacker who made that wired tiger and when she lets him go she even remarks to dredd stating that its the only difference she can make and when she looked the tiger again I think she exclaimed recollecting that tiger from the hacker guy's mind reading process earlier.
I hope the theory for jackets works out ;)
