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: The number of feathers in Zazu's tail repeatedly changes from three to four throughout the film.
Continuity mistake: When the bird bows down at the start, the lion is smiling, in the next shot, he is no longer, and he didn't have time to wipe the smile off his face. (00:01:45)
Continuity mistake: Right after Simba grows into an adult during "Hakuna Matata", Timon walks onto Pumbaa's head and stands directly above his eyes. But once everybody starts singing together in the following shot, Timon has changed position and is now standing behind Pumbaa's black mane instead. (00:47:20)
Continuity mistake: During Pumbaa's flashback scene in "Hakuna Matata" where he joins several other animals by the waterhole for a drink, an elephant with notches on its right ear gets a whiff of him and dashes away. But just before the elephant runs off screen its ear suddenly has no notches, but smooth edges instead. (00:45:05)
Continuity mistake: In one shot during "Hakuna Matata" Timon bites through half of a red and black bug, calling it piquant and pleasantly crunchy. He holds the other half in his left hand, and at first one of its hind legs is noticeably intact. But this hind leg suddenly vanishes as Timon is enjoying the flavor (it doesn't visibly fall off for instance - it simply disappears into thin air). (00:46:30)