The only animal that is not actually a real one is Kaa. Due to the difficulty in training snakes, a combination of CGI, animatronics and puppetry was used.
Actually when lady points out monkeys, she identifies first one as macaque, then the next two as Rhesus monkeys (which are also called Rhesus macaques), and the last two as Langurs. The ones that she points out as Langurs, are actually Lemurs, but they look a little alike.
When Mowgli sees Kitty after his fight with Kaa in the monkey city, right after he jumps towards her, a part of his costume unbuttons then the camera flashes to Kitty. When it flashes back to Mowgli his costume is buttoned.