1) Don't rush doing Tasks -- take your time analyzing the Task's question, as well locating the right answer for it from the data that will be provided to you
2) Before you finally submit it, re-read your answers for the second ( if not third and fourth time ) just to make sure -- make sure you got everything right, down to the decimal marks and/or quotation marks ( really )
3) Keep notes -- should there be a dispute over the answer, ready to provide the Job ID, screencaps/directions where you found the answer for the Task so you can get back your accuracy rate when you inquire at the CrowdFlower Forums
And last one: just keep on clickin'