So Cornelius didn't even ask her to marry him
Sorry if this has been discussed before..
In the movie, he puts the ring on Thumbelina yet he never really asked her hand in marriage (unless it happened before and we just didn't see it). I just always thought that was funny because the most he asked of her was to meet his parents and yet a lot of the characters comment on how Thumbelina is going to marry the prince or how she was engaged to him.
"Use your loaf, ya flabby little muppet."
-Kevinology