There are a few words still in American usage that are now almost entirely missing from UK English, some in UK still use get and got, but gotten has almost disappeared. My parents and early schooling used to discourage use of "I've got" preferring I have" or "I own", getting was still acceptable but could be replaced depending on context, as in "I'm getting/becoming tired of ... ... " whereas "I'm getting a ... ... ... " was OK.
Pronunciation is more a question of regional dialects/accents but also class, these have tended to fade in UK since the beginnings of radio broadcasting and changes in schooling. One big loss is use of second person singular, thee and thou and the resultant loss of the associated parts of some verbs - I am, thou art, he is, etc. Regional accents and dialects can also be different between urban and rural areas of the same region, rural tend to be softer and slower, urban can be harsh and rapid, the "upper classes" would use far less dialect.