Near the start of the story, Captain Taneel breaks Nosh out of prison, where he's being held because he's been falsely accused of killing the Emperor. Nosh points out that he'll just be hunted down and re-arrested, but the Captain says that to prevent this, she'll destroy the prison colony's data centre. Because the prison is so remote that it rarely synchronises its archives with the rest of the Empire, the Captain says Nosh's file will thus be lost forever, presumably sparing him further pursuit. But... he's been accused of killing the Emperor. It's a big deal. Officials would note his absence from the prison (or of his body from its wreckage, at least). People will have heard of him, and will know who he is, file or no file. Also, he was brought to the prison colony from somewhere else; wouldn't records of his alleged crime and of his transfer to the prison also exist there, at least? Later plot developments make all this a moot point, but it's still odd that the Captain and the other characters expect this plan to work at all. Yet it's a major and necessary plot element: the destruction of the prison's archives is the reason why Skeeter's amnesia is such a big problem for the Empire.
It is implied that the ring drive is the only form of Faster-Than-Light Travel in this setting (and probably the only form of faster-than-light communication, too). Only the Humans and the Continuum have it. Yet quite separately from them, there exist vast interstellar empires, interstellar trade, interstellar warfare, planets where you can find individuals from hundreds of different worlds gathered together to do business, numerous interstellar freight ships that consider it no big deal to pick up a bunch of hitch-hikers for a moderate price, and take them to other planets at the speed of plot... Not all of this is necessarily completely illogical — other science fiction authors have conceived of interstellar civilizations where travel between stars still takes decades or more, at merely near-light speeds. But details in the comic and the back-story sometimes seem to imply the existence of something like Casual Interstellar Travel... at slower-than-light speeds.
It's particularly puzzling since possession of the Drive is implied to be a major advantage (as it should be), but this advantage doesn't get demonstrated much. The Empire's even been in a couple wars, and did not fare as well as one would expect...they weren't even able to beat the Tesskans on their own.