Errors in geography
Incorrectly regarded as goofs
The pants are visibly too big for him, when Steve arrives at the lab. When he rushes after the Hydra agent, after having been transformed, his pants visibly leaves much of his legs exposed.
Drill Sergeants often yell at recruits in boot camp for things that others have done, or have not been done at all. Trying to harass an unwanted recruit into quitting is a normal tactic in boot camp.