people not telling others about major issues (the black hole), kids wandering about unescorted on a strange planet, nobody checking what had happened to the security fence, the fuel issue (the native eels drank it, even inland, but in episode 6 one of the crashed ships will have all of it's fuel still in it), no one checking Doctor Smith is who she says she is (the pro-tem leader would surely have a a personnel database with this info, as they could tell how many, and who, had died), why an 11 year old had to pass tests to go on the trip (what, they would have made the family go without him?), and, as Mon General states, the totally unsafe airlock design.