[dri_ft]

There's quite a lot of work on this kind of thing; any edition of Shakespeare with good notes will alert you where a line resembles something 'proverbial'. One thing you notice is that although he often alludes to proverbial sayings, he seldom includes them verbatim - more often, it is a glancing, passing suggestion of them, or he uses them with a twist, or as part of some more complex figure of speech he is developing.

edit: there's actually a great example in the article: "No man’s pie is freed from his ambitious finger".