Can authors/acknowledgements be edited once paper is published? Following on from my previous question, can the authors/acknowledgements section of a (review) paper be edited once the paper is submitted? Specially adding on people to the authors/acknowledgements. 

If yes, how should this be done? I'm assuming it requires the permission of the people already listed as authors on the paper?
Generally speaking, adding to the authors or acknowledgements after publication would be very unusual.


I can imagine it might happen for acknowledgements ("terrible oversight, very embarrassing, we didn't mention XY, please could you change..."), but even then, it would not be surprising if the journal says no. 
However, I am finding it very hard to imagine it happening for authors. The editor will ask - if this person had already contributed enough to be an author, why weren't they listed earlier? And if they hadn't contributed enough at the time, why are you trying to make them an author? I can't think of a good answer to either of those without imagining a very unusual set of circumstances.


After submission but before publication, however, things are a little more flexible.


It should not usually be a problem to add to the acknowledgements during the submission process - note the enormous number of papers that acknowledge the help of the peer reviewers, which of course couldn't have been known at the time of submission! Many publishers even explicitly recommend that you do not include acknowledgements in the submitted paper, as this can be a problem for double-blind peer review.
Adding an author at this point would still be pretty unusual. You might be able to persuade an editor that there was a simple administrative error that meant you missed off an author from the original submission, but this would still be seen as quite strange; in theory everyone who contributed to a paper enough to be an author should have seen it before submission and been able to notice that their name was missing. 

The one plausible circumstance I can think of where it would be reasonable to add an author is if the paper has changed and they have contributed an appropriate amount to the new version of the paper. For example, perhaps the reviewers concluded that your work needed some particularly specialised statistical analysis, so you went off, found a statistician with the relevant expertise, and incorporated their work into the revised paper. The statistician has now done enough work to be considered an author, so you add them to the authors list (and explain very clearly to the editor why you've done this, because they will ask those questions above...).


Finally, minor clerical changes should usually be fine before publication - changing a name because you've written Jane D. Smith rather than J. Diana Smith, etc. After publication, this comes down to journal policies - some will permit it, some have a hard line against it, some are vague.