None. This is a show for small children.

Xavier Riddle and The Secret Movie had airplanes in thunderstorms, but no gore.

Xavier hurts his arm in one episode, but there is no gore.

None.

In an episode I Am Mark Twain, Xavier Riddle clearly says "dang" but the subtitles on Prime Video say it as "damn".

None.

In Xavier Riddle and the Secret Movie, there is airplanes in thunderstorms which may frighten VERY small children.

Xavier hurts his arm in one episode, but there is no gore.

Some falls and crashes

In the episode "I am Jigonsaseh" the trio argues what to make out of cardboard boxes and of who knocked over the shells. That can upset those who are sensitive.