In the movie, the blade Motoko uses is not her usual polished steel Katana, but instead a very dark colored blade. Closer inspection of the sword's hilt reveals it is the Cursed Blade of Hina from the previously unreleased 25th Episode of the Love Hina TV series (this episode can now be found on the Love Hina Christmas Movie DVD). In Episode 25, it is revealed that her blade was broken in a duel with her older sister, but Keitaro gives her the cursed blade. Assumedly, Motoko kept the sword as her own since it appears in the movie.
Unlike the TV series and the first two OVAs, the character designs closely resembled the original manga created by Ken Akamatsu.