[jbjohns]

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").

[arnsholt]

That’s called an intrusive r: https://en.m.wikipedia.org/wiki/Linking_and_intrusive_R

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.

[denton-scratch]

French pronunciation has something like this. They can't abide a word that ends in a vowel-sound smooshing into a following word that starts with a vowel-sound. So, for example, the word "suis" is pronounced "swee", unless the next word lacks an initial consonant, in which case the trailing 's' is sounded.

So "Je suis anglais" is pronounced as "Je sweez anglais". Compare "Je suis francais" ("Je swee francais").

[arrowsmith]

As in the Beatles song A Day in the Life:

I saw-r-a film today, oh boooy

[vintermann]

I've taken Andrew Ng's coursera courses. I'm almost blind to American dialects (compared to Norwegian dialects the changes feel extremely subtle), but I noticed that one! "Dater science" was definitely on the "agender"! But I don't feel like all Americans have it that strongly.

[thewix]

Common in the States too. I'm from Eastern MA and work in Boston. If I order a "vodka, soda" it sounds normal, but if I say "vodka AND soda" then "vodka" becomes "vodkar". My accent is a pretty standard Eastern New England accent.

[arrowsmith]

Only if the next word starts with a vowel.

[walthamstow]

Our Aussie data scientist does it at the front of data as well, so if comes out 'dartah'