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: 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.
Continuity mistake: When the doll-bomb blasts and Jumba is knocked down, a pink sticky note appears on the fridge.
Continuity mistake: When Stitch leaves Lilo's bedroom, his bed disappears between shots.
Continuity mistake: In the dance class scene, the girls slip on the water and fall over. In the next shot, the older girls are suddenly standing a lot further behind them than they were in the previous shot. (00:12:22)
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.
Answer: There are two times when this happens the first time he is holding his guns. The second time he is holding a frog.