Bad Export for You: When the triple-film DVD came out in 2009, many expected all three movies, including this one, to be widescreen unlike the previous VHS and DVD release. Sadly...no dice.
There's also the fact that no Western DVD release has included the Japanese version. This is par for the course for Pokémon, but the Japanese version of this movie is in greater demand than the other movies due to its differences from the English version.
Throw It In: The commentary remarked that Misty's "please, no" reaction to Ash's death was originally, jokingly ad-libbed by Rachael Lillis as "my bike!" when trying to find a workable two-syllable reaction to said event.
Urban Legend of Zelda: There's a rumor circling that Mew in the Japanese version said that the originals were inferior and should perish. According to Meowth (Nyarth in this version) its dialogue was:
The real one is real. If they fight only using bodies without skills, the true ones will not be beaten by their copies.