When 625 exits Gantu's ship, he is holding a stack of cheese sandwiches. After he asks Gantu if he has not been paying attention, some of the cheese slices have been replaced with bologna.
When Lilo climbs and falls over the fence into Mertle's back yard and crushes Mertle's tent, the flashlight she was carrying disappears. Then when Mertle and her friends come rushing out of the tent Mertle shines an identical flashlight on Lilo.
When Gantu tries to fly away in his spaceship, Stitch grabs onto the wing of it to prevent it from taking off, without holding onto anything on the ground as an anchor, and it somehow works until Gantu blasts his thrusters at him. No matter how strong Stitch is, he wouldn't have been able to stop it from taking off since he's nowhere near heavy enough to weigh it down like that.
When Stitch hot-wires the red spaceship, a shot of him from the rear shows his ears have the same cuts (left lower, right upper) as though he was facing the camera.
When Gantu blasts Stitch with the net cannon, the ties on the net are black instead of red.
On the DVD and VHS covers, it is stated that the film runs 64 minutes.