
Continuity mistake: After Stitch regurgitates the two slices of cake he replaces both onto one plate, and the second empty plate vanishes from the table. When Stitch smells the bait and hops off the chair, the plate with the two slices of cake has also vanished (the height with the cherry on top would be seen). (00:32:25)
Answer: No she opens the back door for Mr. Bubbles - you see him later open the front door that is still nailed shut.