As an ex-teacher of English, who also happens to love English literature and who is very careful about spelling and punctuation (the latter is often arguable and can be idiosyncratic and I do allow for that), it does annoy me when I come across glaring errors.
I bought my Christmas cards some weeks ago and they are now all ready for posting (this is not intended to be a boast!) and I bought them with the picture in mind and it was only as I was writing them that I came across two absolutely glaring errors. Both were in the same box of cards - one was a beautiful card of geese standing in the snow and on the back the caption read - geese outdoor's in winter. The other was a pretty photograph of a tawny owl sitting in a snowy beech tree (obviously beech because they hold their leaves longer) and here the caption on the back read - 'tawny owl on the beach while snowing'.
The first caption of course has a misplaced apostrophe, while the second caption has a spelling mistake (beach instead of beech) and in addition I would really question the grammar. (it does tend to suggest that the owl is snowing and would have been better if it had said 'tawny owl on the beech in the snow').
Do such things matter? Am I nit-picking or should we try to uphold standards? I know that often we all make mistakes when writing our posts - but really, on Christmas cards should there not be some kind of proof reading to help avoid this?