None.

Though there isn't anything too violent or any gore at all the only thing that could consider being a little violent is for the main character when he enters the movie world he appear in a few near-death moments.

None, the whole short has no lines.

None.

In his short it happens a lot of things when the man and the little girl enters a magical theater were many different things happen when the little girl plays the piano.

There is one jumping moment when a cute cartoon flower from an animated movie suddenly quickly changes into a scary movie where we see a zombie hand reaching out.