Continuity mistake: This is hard to see, but look at the whiskers on all the lions, the number of them changes about (I'm not exaggerating) 100 times, especially little Simba.
Continuity mistake: When the three hyenas are chasing Simba and Nala in the elephant graveyard, one of them is standing on top of a bone, then next second the bone is gone.

Continuity mistake: During the stampede, the branch onto which Simba hangs changes shape between shots.

Continuity mistake: In the beginning of Timon's hula dance, he is not wearing his lei; then, right before he turns around, it suddenly appears.
Continuity mistake: When the hyenas do the "Nazi Salute" to Scar during "Be Prepared," all of them have the same model and lack spots.
Continuity mistake: During the scene when Banzai climbs up the rock covered in thorns, Ed's notches in his ears appear flipped and don't look like they do in all previous shots.
Continuity mistake: When Scar wants to eat the mouse, he holds it with his left paw. When Zazu calls out to him, he holds it with his right paw.
Suggested correction: This change does not occur between shots. When Scar holds the mouse up with his left paw and dangles it over his tongue, it then cuts to a shot facing Zazu as he says, "Didn't your mother ever tell you not to play with your food?" In the moments that Scar is offscreen, he lays the mouse on the ground and covers it with his right paw.
Continuity mistake: Scar's paw has a light brown line between the pad of his paw and his toes that disappears later in the movie.
Continuity mistake: The number of feathers in Zazu's tail repeatedly changes from three to four throughout the film.
Continuity mistake: In the 1995 VHS version of the film, at the end of the Elephant Graveyard scene, Scar's shadow is not matching the way his body is posing. This was corrected in the 2003 DVD version.
Continuity mistake: The number of stripes on Timon's back between shots change from 5 to 6.
Continuity mistake: When Simba is talking with his father on the clouds, he has 6 or 7 whiskers but they become 4.
Continuity mistake: During "Be Prepared", we see legions of Hyenas marching past Scar, casting no shadows at all against the back wall. In the next shot, we see stripes of shadows going past Scar.
Continuity mistake: When Timon and Pumba save Simba, Timon lies on a bit of dry land. Its shape changes between shots.
Continuity mistake: After Timon and Pumba rescue Simba, they take him to an oasis. After Timon wets him, the leaves behind Simba change shape.