Continuity mistake: At the animal shelter, the box on the left has an "In" label that disappears between shots.
Continuity mistake: Lilo shows Stitch her bedroom, and he arranges toys around, with a toy plane facing Lilo and a clock tower with the time 8:10. A shot later, the plane is facing the opposite side, and the time on the clock is now 5:00.
Continuity mistake: After Lilo's house explodes, she stumbles and falls. The position of the roof behind her changes, plus a spoon and leaves suddenly appear next to her between shots.
Continuity mistake: After Lilo's house is destroyed and she runs away with Pleakley, the damage suddenly diminishes noticeably between back and front shots.
Continuity mistake: When Lilo tries to teach Stitch to fetch, the wagon changes position between shots.
Continuity mistake: At the animal shelter, when the clerk tries to talk Lilo out of adopting Stitch, Nani's arm is very close to Stitch's tummy. A shot later, it's awkwardly twisted around and stretches out from a low place; and yet a shot later, it disappears, only to - drumroll - reappear immediately after.
Continuity mistake: When Nani, Lilo, and the clerk are at the shelter, the posters next to the lift door disappear.
Continuity mistake: When the doll-bomb blasts and Jumba is knocked down, a pink sticky note appears on the fridge.
Continuity mistake: When Stitch finds Lilo's family photo, it lays right next to the top sheets. When Lilo says, "That's us before," the sheets have moved further below.
Continuity mistake: When Stitch leaves Lilo's bedroom, his bed disappears between shots.
Continuity mistake: When Stitch leaves Lilo's bedroom, Lilo's mustard-coloured duvet swaps to green-coloured, plus she disappears from the bed. Sure, her head is off screen, but there's not even the bulk of her body protruding under the covers.
Continuity mistake: When Lilo tells Stitch he can leave and that she'll never forget him, a shell on the night table disappears between shots.
Continuity mistake: When Stitch arrives at the beach dressed as Elvis, a red starfish in front of him disappears in the wide angle, only to reappear in further shots.
Continuity mistake: When Nani is first seen in her room, we see an alarm clock reading 7:15 on her bed frame. A couple of shots later, when Lilo and Stitch present his trick, the clock doesn't read anything. It turned itself off.
Continuity mistake: When Stitch first presents himself to Lilo in the animal shelter, his left ear notch vanishes completely as he turns his ears.
Continuity mistake: In multiple shots, Stitch's ear notches move higher in places or vanish completely.
Continuity mistake: When Jumba attacks Stitch in the house Lilo's sandals keeps disappearing and reappearing.
Answer: There are two times when this happens the first time he is holding his guns. The second time he is holding a frog.