I'd say that it depends on how the company requested resumes to be sent. If they requested fax or email - and you instead dropped off a "live" resume - then they could conclude that you're a person who can't, or doesn't want to follow, directions. I see now that you did both, however the hard-copy resume might not have earned you extra points.
I agree that it could have been convenient if you were passing right by there anyway, and/or wanted to have a "live" look at the work environment before an interview. However, I don't know whether it would have given you additional brownie-points - probably you can only wait and see.
I think a retail environment is a bit different - there tends to be more turnover, and if the manager is available she certainly might want to talk to applicants right then and there.