This movie premiered in Japan between the episodes between The Forest Grumps and The Psychic Sidekicks. Judging by the storyline, it takes place after Fowl Play, because Ash's Noctowl is present, but before Hassle In The Castle, because Brock's Crobat is still a Zubat, so its premiere took place in proper time.

Two Pokémon Dolls in Molly's room, Phanpy and Teddiursa, are later imagined as her own Pokémon, when she battles against Misty and Brock. Even later on, in the credits, she gets her own Teddiursa.

The movie's title, Spell of the Unown, refers to both the fact that the crystal covering much of Greenfield is made by a spell that the Unown have made, but as well that Unown are able to be used to literally spell out words and phrases, which Molly does with the tiles.

Some of the Unown that appear on Professor Oak's computer are, as of yet, unreleased. However, since they're just drawings, it is possible that they don't really exist in Pokémon world.

The Unown at the bottom of the cover spell out Entei. This is most likely because of his large role in the movie.

picture in Molly's book has similar wings to a Beautifly.

This is the only original series movie not to feature a Psychic-type legendary Pokémon as the main Pokémon.

When Jessie and James help to save Ash from falling, they break the fourth wall by saying that without him, they wouldn't be in show business.

According to promotional maps, Greenfield is located on Route 32, about halfway between Violet City and Union Cave.

Charizard returns from the Charicific Valley to help Ash out and then returns during the ending credits. Liza and Charla also appear.

This movie made $17,000,000 and cost $3,000,000 to make.

This movie spoiled the captures of Ash's Totodile and Noctowl.

Debuts: Entei, Molly, Unown, Flaaffy, Teddiursa, Phanpy, Kingdra, and Mantine

A part of Ash's past is revealed in this episode: Ash met Molly prior to the first episode.

Fourth Wall Breaker: Meowth asking Jessie and James if they will have a bigger part in the next movie.

Ash: (to Molly) We always battle hard but we always stay friends, because we all love pokemon.

Meowth: I don't like the looks of this Jess!
James: It's like a story-book land invented by a five-year-old!
Jessie: That's ridiculous James! Just keep running and leave the thinking to me!

Entei: What is this?
Ash: My friend Charizard.
Entei: Your friend?
Pikachu: Pika!
(Charizard breathes some fire)
Ash: All of my Pokémon are my friends. We all work together like a family.
Molly: A family?
Entei: Then I will defeat your family too!

Meowth: Do you think we'll have a bigger part in the next movie?

For some reason the report from Prof. Hale about the Unown contains numerous mistakes. Not only is the word Unown spelled with k, although it was definitely intended to be the name of this Pokémon, but there are also other obvious mistakes (e.g. careful with two l, Pokémon without the acute accent on e, a confusion of singular and plural in the second and the fifth items, a misspelling of telepathy, and numerous grammatical errors). The Unown misspelling doesn't happen again until Journey to the Unknown!, 8 seasons later, with a different dub team.