OK, before we continue digging, a question:

Why, in a play that is mostly poetry (by my count, poetic lines make up over 86% of the total lines of the play), and mostly blank verse, UNrhymed iambic pentameter (and, again, by my count, over 75% of the poetic lines of the play are unrhymed)... 

why, then, does Shakespeare use 350+ lines of rhyming poetry in The Comedy of Errors? 

No answers from Bill today... just leaving it all up to you in the blogosphere... 

Respond, discuss, knock yourselves out... we'll talk more about it at some future date...