Sentence:  The problem of error is crucial, for as "Watt" interrogates the foundations of rational inquiry, the distinctions between intended errors, authorial errors, mistakes introduced by publishers, changes of intention and other <WSD>obnubilations</WSD> loom all the larger. 
Meaning of the word marked with <WSD> tags:  Something that (obscures) or causes (confoundment); an (obfuscation). (1999)