Continuity mistake: As Tiana and Naveen are floating over the swamp hanging onto the balloons, the amount of balloon strings alternates between three and four stings depending on the angle. Most of the time, when the shot is on Tiana there are three strings and when on Naveen there are four. (00:33:00)Shannon Jackson
Continuity mistake: When Lawrence finds Naveen playing with the local jazz band, we see three young girls standing together on the left. Then a few shots later, two are standing together with a different lady who switched places with the third young lady (the different lady is tall and has weird looking feet).
Continuity mistake: Hoping to turn Naveen from a frog back into a human, Charlotte kisses him seven times, leaving seven sets of lip prints around his mouth. He remains a frog, but in the next shot, all the lip prints have suddenly vanished.