Some episodes are very light-hearted but turn unexpectedly dark and scary at the end.
In some episodes, Eda turns into a out of control horrendous beast. This can frighten children.
The last two episodes of season 1 are more serious and may be frightening to children.
King, a monster resembling a little wolf, claims he was a 'demon king'. This may feel somewhat confusing to those who are religiously sensitive. He also later in the series talk about a castle where he was the king, referring to some of the rooms as rooms where he crushed the skulls of his enemies, and other slightly disturbing things.
In "Enchanting Grom Fright", the Grom becomes Luz's mother, and becomes angry and grotesque, which is a resemblance to Coraline. This may scare young viewers, even when the Grom yells "WHY ARE YOU RUNNING LUZ!?". The Grom may be scare to look at and hear talk.
Season 2 episode 4 may be hard to watch for viewers with parental issues.
"The Owl House" has caused a lot of controversy about supposed Satanic symbologies, but the supposed references to Satanism are only jokes that have no religious context, it is a fantasy series. They don't believe everything they see
There are many scenes in season 2 that may be emotionally distressing to viewers.
Season 3 is overall much darker and more serious than the previous 2