Continuity mistake: When Wallace is put into his overalls he's still wearing his green pullover. A moment later he suddenly doesn't wear it anymore but a complete white shirt. He couldn't have just taken off the pullover as the shirt under it is actually fake (The collar is actually part of the pullover and the arms are just stuck on).
Continuity mistake: This is after news has arrived to the elephant village that Ayutthaya is fighting back after being occupied by the Burmese for some time. The raiders arrive and are rounded up before falling into a trap. At first, the pit is almost square, with rounded edges. Cut to an aerial shot and the same pit is now a circle. (00:50:45)
Continuity mistake: When Barris is served in the diner, french fries are scattered over his plate. When seen again, the french fries are replaced with vegetable sides.
Continuity mistake: The buttons on Amos Slade's shirt repeatedly change sides between shots throughout the movie. One example is while Copper and Tod are swimming, when Amos tells Chief that Copper has strayed off again, the buttons on Slade's shirt go from being on the left to being on the right, then back to the left again. (00:21:50)
Continuity mistake: When the Lion says, "Now, to an all musical program" he raises his arms and his shadow is behind him up on the curtain. But without him moving, it cuts to a far shot, and suddenly his shadow is on the ground beside him with one arm of the shadow up on the curtain. (00:02:20)
Continuity mistake: After cutting through Black Manta's gun, Aquaman then slams Manta in the face with his trident and knocks him down. As he is twirling his trident in victory, you can see his belt and its design. But then it cuts to a close up of Aquaman and suddenly his belt changes in design with the bar in the middle disappearing and the black of his pants extending further up onto his orange shirt in the belt area. (00:03:50)
Continuity mistake: In Kandor, Superman punches a hole in the ground and picks up a large chunk of the street out of the hole, but does not move from that spot. The shot changes to the robot's perspective of him about to throw the rock and shows his feet. The ground he just punched and picked up is in perfect condition at his feet. No hole, no cracks, no sign of the damage he just made. (00:41:15)
Continuity mistake: Hunky takes off chasing the truck that took Spunky and tries to save him, but then trips and slides on his face and belly on the ground, coming to a stop. There is a large rock beside him. When the camera changes angles, the rocks design changes significantly. (00:01:40)
Continuity mistake: After waking up, Lulu's clothes are suspended from the ceiling and she leaps from the bed down into them, getting them perfectly on her in an instant and then runs off. Her hat is not amongst the items, and as she runs off screen you see that she has nothing on her head. But the shot changes to her running directly to the bathroom, and suddenly her little red hat is on her head. (00:01:10)
Revealing mistake: When the elephants are making fun of Dumbo in the train caboose, Dumbo's mother pulls a pin which causes the stall door above the other elephants to fall. When the door bounces back up, you can see that the animators forgot to draw the elephants' heads and trunks and only their bodies are visible.