In the 'Can You Feel The Love Tonight' sequence [in the French track], after Timon and Pumbaa have catapulted into a tree, in the song you can hear a gasping noise. The song was taken from the first Lion King and the noise was Nala gasping for breath after Simba pulled her into the water.
At their first home by the water hole, Pumbaa hands Timon a drink in a coconut shell with a straw and umbrella. As Pumbaa starts to leave in the next shot, the straw is gone, yet Timon seems to be holding and drinking through it. In the following shot, the straw is back.
In the first Lion King movie, near the end, Scar blames everything on the hyenas and that is why they turn on him (at the end, after Simba throws him off the ledge). In this movie, it shows the hyenas being lured away from the final conflict between Scar and Simba, therefore they would not have heard Scar, and thus contradicts the first movie.