I'll get you started and maybe some of the other members will add more:
This sounds like very colloquial North American English --> The use of is like to report what someone said (this is possibly more common among younger people).2. She is like "no" and I am like" Why not?"
The word less is grammatically incorrect and should be fewer but this usage of less with plural nouns is amazingly common --- on both sides of the pond, I believe. Less + plural = informal/colloquial.3. There are less cars on the roads on Sundays.
Additionally, I've heard people claim that the use of the word car vs. automobile is an indication of where the English comes from. Some people have the mistaken impression that Americans hardly ever use the word car. But Americans use the word car quite regularly.
I'd say the word gotten is a definite indicator of American English. It is standard in the US and is definitely not considered "colloquial"! Pretty (well) is also quite common in the US.5.We have already gotten to know each other pretty well.
American English, the form "gotten" is rather colloquial, I would use it while in USA, "pretty well is common in BE and AE (or not?)