Consider that a paper is published in a journal. It contains some insignificant errors which are not worth asking for an erratum. I was wondering in such a case would it be acceptable to fix those errors in the preprint version (for example on arXiv.org)? Since in this case it will be sort of a “post-print” version of the paper and technically an improvement on the paper, would it create a problem with the journal in a typical situation?
Edit: Let’s assume that the editor agrees that the errors are too minor for an erratum. What I want to know is if there will be any legal issues and more importantly: if it is a good idea scientifically?