Continuity mistake: When Lone Starr 'knocks out' the guard who was shaving, the guard's grey key card falls to his side, but in the next shot the key card is laying on his butt. (01:11:50)
Continuity mistake: When Helmet is trying to hit Lone Starr with his Schwartz but Lone Starr is holding his head, you can easily tell that Helmet's Schwartz is made shorter so it won't hit Lone Starr.
Answer: It also might stand to reason that the very fact that Druidia has a shield is what makes it viable. It almost creates a docking port for Mega Maid who was presumably designed for that very purpose. After all, what other purpose could a space maid with a vacuum possibly have?