I do that mis-reading thing all the time. It's not from drug withdrawal, never been on anything stronger than tramadol (and that for 3 days, then the headaches hit), officially no concussion, tho my husband got a severe one in the accident and I now have significant trouble understanding what I hear (despite "perfect" hearing on the tests) and placing where I hear things (always opposite, if I hear it on the left, it was on the right, behind me means it was in front somewhere....), and dizziness and eye problems are worse than ever. Eye problems and my head trying to make up for what they are not seeing in coordinated fashion mean I see all kinds of weird things in headlines, the guide on the tv, anything printed.

It has become a running joke in my house that "Torched by an Angel" is showing on TV. Misreads all the time, just like you say, switch a letter to make a different word, or just plain change words, drop words, add words. I think my head tries to "fix" what my eyes are not sending in clearly. It can be rather funny, hubby who does have pcs does it too, we've decided to just enjoy it. Usually makes for a better conversation that what was actually written would have.