1. Cause before effect, reaction before action, syntax errors
Another mistake that this reader often notes is that the authors evoke the reaction to something - for example, fear - before the action that provokes it, or describe the consequence before what provoked it.
In a sentence, if you use when, then, before, during, until, after, since ... be sure to write the cause then the consequence, or the action then the reaction.
The reader points out that sometimes you just have to swap the sentences to get there.