Trivia: Here's a brief list of the moves from the game that made it into the film: Ryu threw a fireball at Vega. Ryu does a hurricane kick against Vega. Vega did his rolling attack against Ryu. Ken does the standing uppercut against Sagat. E. Honda does the hand slaps against Zangief. Balrog does the wind-up punch against a Bison Trooper. Guile did two Flash Kicks against Bison. Cammy did a thrust kick against a Bison Trooper. Chun Li does the spinning bird kick against Bison.
Trivia: The paintings in Bison's room are references to Napoleon Bonaparte and the serial killer John Wayne Gacy.
Trivia: Raul Julia agreed to make the film because his kids were fans of the arcade game.
Trivia: When Honda and Balrog are throwing the barrel around with Chun Li in, the barrel says Capcom, Street Fighter's creators.
Answer: In his fight with the guard, Dhalsim gets knocked into some chemicals. This presumably changed him. This is also likely the explanation if he had to do any signature moves from the games, which thankfully, he doesn't.