Audio problem: (May only apply to the original VHS release.) When Scar has Zazu locked up in a cage, Zazu mentions Mufasa's name and Scar yells at him, "What did you say?" Right before Scar's actual line, whilst Zazu is talking, you hear Scar's "What did you say?" line very faintly in the background, even though Zazu has not even mentioned Mufasa yet.
Audio problem: In the scene where Sarabi gives Simba and Nala permission to go to the waterhole, Simba yells "Yeah!" and you can distinctly hear that Nala says "all right!" But it's animated so both Cubs appear to be exclaiming "Yeah!"