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.
Deliberate 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: No she opens the back door for Mr. Bubbles - you see him later open the front door that is still nailed shut.