This is the first time Team Rocket is seen working alongside the main villain of the film.
This movie is an example of the grandfather paradox.
One idea for the film originally had Raikou, a counterpart to Suicune, appear instead. Suicune was added when it was determined the film would involve a lake.
A Celebi Pokemon trading card was given out in theaters in the USA.
Sam's hobby of sketching Pokemon is shared with Tracey, who coincidentally becomes his assistant.