Well, it seems like they were always under thrust, so they couldn't just space-walk like that.

And like in episode 1, any parts that "fly" off the ship would be flung outward.

Big mistake to even think of disposing of the dead in space, when they're trying to grow food and need fertilizer and stuff. All of them should have been smarter than to even consider it.

And why would they use DRINKING WATER for the cooling system in some kind of atomic propulsion system?

Oh and once again, many parts of the ship aren't rotating yet apparently still have "gravity," even though there was no indication of artificial gravity technology and when the sleep-pods area stopped rotating, people began to float around.

Since the garden dome thing doesn't seem to be rotating, there wouldn't be any gravity there either.

And people sure seemed to lose interest in the one guy knowing about the murder weapon, then they just went to bed.