Interestingly, at least British and Australian people tend to make the 'R' sound when the word ends in a vowel sound (e.g. "dater" instead of "data").
Originally comes from a final r being pronounced before a word starting with a vowel, and then that cropping up in places with no final r.
So "Je suis anglais" is pronounced as "Je sweez anglais". Compare "Je suis francais" ("Je swee francais").
I saw-r-a film today, oh boooy
Also, The Lincoln Lawyer has an Australian actor playing a character (Cisco) with a gruff, throaty American accident, but at one point it slips through and he says “Lisa” as “Liser”.