When Mel contacts her two hacker friends she tells them that they there are 15 people on the runaway bus. However, in the previous shot of Van Erp making a toast as the bus begins its journey, there were only 13 people on the bus.
When Mel is in the field feeling distraught and guilty over the murder of Buddy, she lets out a grunt and then covers her mouth and nose with her left hand as she cries in anguish. However, in the next cut, she repeats the same action again: grunting and then crying while covering her mouth and nose with her left hand.
During the bus ceremony, the orientation of where the man shooting the starter pistol is standing in relation to the pole changes from shot to shot.
When Thomas maneuvers the pickup truck in front of the runaway bus; the bus rams into the rear of the truck and they get stuck together. However when the truck and bus are shown on the cam monitor; the bus and truck are separated.
If Mel's Trojan Horse disabled all companies connected to the Chinese front, it should have disabled the bus company's as well.
After learning the bad guys have her face scanned, Mel runs around the city without any head or face covering more than one with her expertise would do.