None. Just some mild references involving a frog who wants to marry Thumbelina.
Basically no violence.
A frog trips another frog.
A bird is found to have a broken wing.
None. The closest one is Thumbelina's "oh my goodness", a variant of the more common "oh my God".
None.
Percival the Pig makes a bullfrog to kidnap Thumbelina, leaving the kind widow saddened by Thumbelina's disappearance.
Thumbelina sees a couple of scary-looking trees with evil-looking eyes, before reaching a waterfall.
What appears to be an earthquake taking place at Mrs. Mousy, simply turns out to be Mr. Mole digging.