Don't fret. A few years ago whent he market was fairly good for designers, I had to send out about 50+ applications to land my first job, a combination of email/printed or both - more electronic. I got 2 great replies, both said yes to me.
I have noticed, like many other designers here most likely, that the design job market is taking a hit recently. How bad it'll get, I don't know. I feel fairly priviledged to be hired very recently for a new job, so we'll see how things go on the whole for design. Good designers will still be hired by the good agencies, even when times are hard.
But the key to any job, is to always distance yourself as much as possible. Even if you love the company and the job, you have to try to be nonchalant as best you can. That's the only way you won't get depressed at the knock-backs you will get when looking for jobs. Sounds harder than it really is, though my other-half wears her heart on her sleave and I have to do a big job trying to keep here grounded when she goes through applications.
The typo wouldn't have helped, but don't stress about it - I'd say 3/4 may not have noticed or let it be a factor, if your work is good.