Though the play mechanics are old hat to Pokéfans, Pokémon Yellow does boast one new feature only visible in movies: Pikachu speaks! On the title screen, he declares "Pi-ka-chuuu!", and chirps a brief "Pi-kaaa" as he enters battle.

Pikachu vs. Rattata QT4, 320x240, 1.9 MB	Opening sequence QT4, 320x240, 1.4 MB
Wandering Pallet Town QT4, 320x240, 0.9 MB