On the other hand, don't try to include works by all your potential reviewers with the idea of prejudicing them in your favor. It's better to omit a work than to cite it but reveal your ignorance of its contents. Do try to make the whole proposal easy to read and understand. Perfect copy isn't required, nor slick typography. Otherwise, ask a colleague who is not directly in your specialty to read and critique your proposal.
Clarity is important.
If you are re-using existing materials from papers or prior grants, in addition to checking that your references are up to date, make sure that the style and content really fit in with the rest of your proposal. If you happen to have a sense of humor, it is not necessary to suppress it entirely. And cute titles are not recommended. If you are proposing a complex series of experiments, restate the point of each one after describing it, and show in summary how they fit together. Make sure your elicitation procedures are adequate to obtain the variations you need.