Continuity mistake: When Entei is running off with Deliah, Ash yells "Mom! Pikachu!", and then the cameraman notices Ash as he runs by. However, when Charizard is viewing the TV broadcast, Ash says the line as he is passing by the camera, not before.
Entei was created by the Unknown. Her dad returns.
Meowth: It looks like alphabet soup but without the soup.
Trivia: In the original Japanese trailer, most of the scenes were fully animated, yet not used in the final cut. Some of the shots were Ash standing on top of a crystal pillar, as the camera pans around him and he is searching for something, a bunch of random wild Pokémon running away from the crystallization, and a shot of Mewtwo standing at the entrance of a cave with lightning cracking behind it. Supposedly, the 3rd and 4th movies were to inter-connect, with Mewtwo being the one who connects them. Perhaps the anime producers decided to throw that away and instead advertise the then-new Pokémon Crystal game? After all, several elements from the game (the Unown, Suicune, Celebi) appeared in both movies.
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