In many episodes, magical events might cause very young viewers to worry whether situations will be returned to normal.
One episode deals with grieving the loss of a parent.
Many episodes are based on fighting monsters, ghosts, or magical happenings. The more stressful situations center around real-world problems, such as possible new step-parents, job loss, friends falling out, damage to one's reputation for being honest, moving to a new city, strained romantic relationships, and so on.
A little jump scares here and there.