The version I was reading was a PDF of an edition published in 1740. I noticed a few smileys in the text. They were unintentional, of course, but they amused me a little.
'saith he, you are in an ill name' sad face
But then later:
'That I and Greatness were compell'd to kiss' smiley face
I'd like to start some sort of theory where Shakespeare invented emoticons, but I don't think I'd get away with it. Maybe it might be a good April Fool to use one day.