It is revealed, in this episode, that Motoko, Su, Shinobu, Mitsumi, Kitsune and Kanako like Keitaro.
This is the first episode in which Naru doesn't hit Keitaro.
In the manga, Naru finally confesses her love to Keitaro at Japan's northernmost point - Soya-misaki. Here, most of the action takes place across Japan, rather than the secret annex itself.
--> In the manga it's Keitaro who has to...
1. show a little backbone when hormone driven Motoko, Su, Shinobou and Kanako join a suddenly "villionous" Kitsune and kidnap Naru.
2. save Naru from the bounty hunter Motoko, the heart-broken Shinobou, and the "used" Kanako and encounter the suddenly villianous duo of Su and Kitsune.
--> Naru, Shinobu, Kanako, and Motoko are the only ones with towels on them when Keitaro is forcibly dragged into the hotsprings with Kanako while Su is butt naked and Mutsumi and Kitsune towels are floating in the water and Sara is wearing a bathing suit.
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.