* Despite the English dub using the ''kanzenban'' footage, the opening of the original North American DVD release uses a hand-drawn shot of the big doors opening.
* The title of this movie is also used in [https://www.youtube.com/watch?v=P-zJOntZRHo Mewtwo's trailer] for [[Super Smash Bros. for Nintendo 3DS/Wii U]].
* The [https://www.youtube.com/watch?v=b70GRNYnacI first trailer]
for Mewtwo Strikes Back showed several prominent scenes that never appear in the final cut of the film. Most notably were scenes of Ash fleeing an explosion, a woman who looks like Misty and a younger character, and Team Rocket standing on a warship.