- American English uses the r flap for the letters t and d between vowels. I think I may have also heard Australians do this?
- I've heard Puerto Ricans when speaking Spanish do something close to what is described as a "Brazilian R". A /x/ type of sound where /r/ would be in other accents. Backed up here: https://en.m.wikipedia.org/wiki/Puerto_Rican_Spanish#Feature...