Corrected entry: The creators of TLK2 were originally going to call 'Vitani' 'Shetani', which means devil, or demon, in Kiswahili. However, Disney changed her name to Vitani, possibly so as not to be as offensive. And if you listen closely, the first time we meet Nuka and Vitani, he says "Hey Shetani", instead of calling her Vitani (the sub-titles say Vitani, though).
Corrected entry: When Zira gives Kovu a nasty scar, she swipes at him horizontally. However, Kovu's scar turns out vertically
Corrected entry: In the first Lion King movie Nala's eyes are green and in this movie they are blue.
Corrected entry: The number of lions keeps changing. An example from the end of the movie: Before the final fight scene, the two prides are shown approaching. There are 13 lions visible in Simba's pride and, after they line up, 13 in Zira's pride, plus Kovu and Kiara = 28. The two prides begin to fight and from the view point of Kovu and Kiara we only see 12 lions. Next when Kiara and Kovu step in to stop the fight there are 20 lions in a circle with Kovu, Kiara, Simba, and Zira in the centre = 24 lions. Zira dies, so we now should have 23 lions. The two prides join together at the end and we only see a total of 17 lions. Keep in mind that there were no dead bodies visible at anytime.
Corrected entry: Kovu was the last born cub before Simba exiled the Outsiders right? So they would have been banished shortly after Scar died because Kovu remembers Scar. The Pridelands now have to be given a lot of time to recover and for all the animals to return. Now Kiara is born, and Kovu should be, if not fully grown, quite a bit older than Kiara. The thing is, THEY ARE THE SAME AGE AND SIZE.
Corrected entry: Near the beginning they show a shot of four monkeys in a tree. They are in a line, picking lice off of each other. The one in the very front is picking too. However there is no monkey in front of him.
Corrected entry: At the end of the film where Zira is hanging from the cliff above the raging river, she was originally going to say "Never." before letting go, making her death suicide showing that she was loyal to Scar to the end. This was obviously cut for being too dark for a Disney film, and this was (rather poorly) edited to Zira losing her grip and falling.
Corrected entry: Zira scratched Kovu across the face and gave him a scar on his left eye earlier in the film. As Zira plummets to her death, they show Kovu choking back tears. Look closely, and you will see that his scar has miraculously disappeared! The next shot shows him with his scar.