The extra four kids with Angemon are voiced by Joshua "Tai" Seth as Teppei, Brad "Kazu" MacDonald as Katsuharu, Tifanie "Yolei" Christun as Chiaki, and Brian "Davis" Donovan as Teruo. Dave Mallow reprises his voice role from Digimon Adventure as (a different) Angemon.
The Other Darrin: Due to fear of damaging his voice from all of the shouting, Takuya's English dub actor Michael Reisz refused to voice EmperorGreymon, giving the job to Dave Wittenberg instead...only for there to be not nearly as much shouting for EmperorGreymon's scenes. Wittenberg also replaces Reisz as Takuya for the movie.
A similar situation became close to happening for the Japanese version, when, exhausted from doing all of the pattern voices, Takuya's voice actress (Junko Takeuchi) asked Kouji's voice actor Hiroshi Kamiya to voice Susanoomon for her. However, Kamiya said that she should do it since Takuya's the main character, and the director overruled the request; as a result, Takeuchi voiced Susanoomon as originally planned.