Other mistake: When Pumba is singing and they show him as a baby warthog farting in the water killing the butterfly, it is actually a baby Red River hog that is portrayed.
Tricia Webster
Continuity mistake: At the end, Scar walks opposite Simba on top of pride rock. He approaches the embers on the floor. We then see him approach the embers again from a greater distance.
Ssiscool Revealing mistake: Numerous time in the film the animals walk from shade into sunlight without their eyes reacting.
Ssiscool Continuity mistake: When Mufasa has to teach Simba a lesson it's still very light all around. By the time Simba walks up to him it's almost dark.
Ssiscool Audio problem: Near the start when Mufasa says "let me explain" to Simba his mouth doesn't move.
Ssiscool 
Suggested correction: Actually, Zazu wouldn't honestly say that Scar was lying; he left Scar at the gorge, but for all he knows, when Scar talks about not getting to the gorge in time, Scar could just mean that he couldn't find a safe path into the gorge to help Mufasa and Simba escape.
Joey221995So Scar would say he couldn't get to Mufassa in time. Not the gorge.
Ssiscool