Are you going to Scarborough Fair?
  Parsley, sage, rosemary, and thyme;
  Remember me to the one who lives there,
  For once she was a true love of mine.

Sometimes people have a small "accent" in writing even when their English is pretty good.

Germans sometimes write 'as' when they mean '(something) like' or 'than' because of the German word 'als'.

French and Germans sometimes write "I've been doing it since 12 years" instead of "I've been doing it for 12 years" because of the words 'dépuis' and 'seit'.

Danes usually mess up the verbs by getting the number and person wrong (because modern Danish uses the same form for all {singular, plural} × {1st, 2nd, 3rd} combinations). Spanish speakers sometimes leave out personal pronouns (because they can be inferred from the verb form in Spanish). And so on and so forth.