The Pretzel for Gesse's Raging Storm super, so named because the motion (1632143 or db,hcb,df) resembles a pretzel. Like most supers in the early games, it was made with an absurdly difficult input command. Unlike most supers in the early games, it kept the motion for most of the games for the sake of nostalgia.
His Real Bout Special form's name of "Nightmare Geese" started out as this as well. The King of Fighters Maximum Impact 2canonized it.
The spinning supers (Senpuuken/Hadou Senpuukyaku) that Krauser and Terry used throughout the animated movies eventually became Krauser's Gigatech Cyclone. Sadly, his youthful beauty, lack of a mustache and scars, as well as an authentic German-sounding voice (which were well-received by fans) were not retained.
Lily was originally planned to be Billy's little sister of the same name. However, due to concerns from game developers, this idea was scrapped during production; her name remained as a small tribute.
Originally, King was to take Panni's place in the movie, and Eiji Kisaragi was originally in place of Hauer. Given Hauer's quirks, this might have possibly been a chance to poke fun at Eiji's EnglishAOF2 ending, where he proclaims his love for Mai (who, thanks to chronology, would have only been a child at the time).