Continuity mistake: When the landlady shows Judy to her "luxury apartment" note the position of the vertical deadbolt lock affixed to the front door and jamb, but the next morning when Judy leaves for the ZPD, as she unlocks the door the deadbolt lock has moved higher up on the door and jamb (note wallpaper). Additionally, just as Judy opens the door we can see that although the interior deadbolt is affixed higher, its key cylinder on the exterior side is much lower, which makes no sense, but then the deadbolt is back to normal.
Chosen answer: 1. No, it's not, that is Travis. The weasel who was a childhood friend of Gideon has brown fur, but when officer Hopps chases the Duke, the Duke's fur colour is brownish orange. 2. The Duke has gone through the period of his prison time, so he did get out - maybe the Zootopia laws are different than ours.