Throughout the film, it is made clear that Pete's hillbilly foster family were very abusive towards him. During a song, they sing about various ways they plan to torture him (e.g. drowning him, tying him to a railway track) and in one scene, he tells someone they would hit him all the time. However, all of this is implied, not shown. The most they are seen doing is tying Pete up in a sack.
Some mild slapstick involving the invisible Elliott the dragon (e.g. a picket fence being smashed, a man falling off a milk truck, a giant dragon-shaped hole in the side of a building.) No one is visibly injured.
A teacher unfairly uses corporal punishment on Pete, slapping his knuckles with a pointer. At one point, she goes to spank him with a yardstick but is stopped before she can do so.
Multiple kidnapping attempts.
In one song, Jim Dale and his apprentice talk about "binding and grinding" Elliott and taking his body parts for medicine.