The character credited as "SGT Hugo Friedkin" is referred to as "Corporal Friedkin" throughout the series, despite wearing an otherwise perfectly good US Army Captain's Uniform, with Captain's bars. A Captain would actually make sense for the role, as a junior officer might be put in charge of a program. A Corporal to run the program makes no sense whatsoever, as that is far too junior a position.
During the firefight between Rimmer, Farah and Estevez, the bullets from Rimmer's machine gun hit the wooden banister, wainscoting etc but don't exit on the rear. Actual machine gun bullets would pass through the wood like it was butter and go through several walls, people etc behind it.
Lydia Spring, who was supposed to be unconscious, moved to Farah Black at 14:30.