Most of the blood in the movie is green - very clearly not human blood. Example: after Mallory cuts a goblin, she stares at the green goblin blood on her sword. Another example is when a tow-truck driver runs over a troll and green blood is shown on the bumper of, and underneath, his tow truck.

Goblins cut at kids legs, but it is not bad. The goblins bite and scratch Simon's leg and arm, and later cut Mallory's wrist. In flashbacks we see the goblins cut the young Lucinda in similar ways.

The kids throw corrosive chemicals - tomato sauce and salt - at the goblins. The goblins bleed and melt onscreen. But it is barely shown.

Children are menaced repeatedly. The battle scenes are suspenseful, but not too violent.

A very sudden and unexpected jump scene while Aunt Lucinda tries to give the book to Jared and Mallory, but goblins break a window and try to grab the book before Jared and Mallory take the book.