When Guile infiltrates the base, he has as his only weapons a pistol and a couple of knifes. But when he fights the Bison troopers in the control Center, he suddenly has a Heckler & Koch MP5 submachine gun. He does have the magazines when he enters the lab, but the submachine gun is fairly bulky and thus should be visible when he comes in.
Here's a brief list of the moves from the game that made it into the film. Ryu threw a fireball at Vega. Vega did his rolling attack against Ryu. Guile did two Flash Kicks against Bison. Cammy did a thrust kick against a Bison Trooper.