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)
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.
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: When Dr. Facilier transforms Tiana back into a human to offer his deal, she is wearing a white dress with a large feather boa around her arms. When Tiana turns to the ukulele player whom she thinks is Naveen, the feather boa falls off her and is never seen again during the rest of her temptation.