Trivia: One of the Mardi Gras parade floats is inspired by The Little Mermaid's King Triton's throne. Jafar from Aladdin is on another float. (01:13:55)
Trivia: In the opening scene when Charlotte and Tiana are children, the camera scans Charlotte's bedroom. The tea set on the floor has 'Mrs. Potts & Chip' from "Beauty & the Beast" sitting on a tray. (00:01:25)
Trivia: This is the first Disney movie since Beauty and the Beast to have the actors who play their characters be their respective singing voices.
Trivia: Beyonce Knowles was considered for the role of Princess Tiana, but did not get the role as she declined to audition.
Answer: They physically left. Just because we didn't see it happen doesn't mean it didn't happen. It's a montage of their activities after they returned to human form.
LorgSkyegon
I thought as much, but it would have been even better to see a montage of them physically leaving the bayou and planning their church wedding.