I also entered wrong birth city for spouse and had my name/surname interchanged. So I did some research and found this link :
http://www.immigration.ca/en/immigration-wiki2/205-home/immigration-manuals/e-application/1377-express-entry-assessing-an-e-application-on-a11-2.html
It seems that UNLESS your updates in the e-APR changes anything materially - i.e. either changes your CRS or makes you ineligible to rcv ITA for any reason in that draw, you should be able to change whatever you want without any fear of rejection. At best, explain your mistake in one line in a letter of explanation - as suggested by Asivad in other posts.