Definitely picked up on this when I visited Dublin recently, it was pretty difficult to tell whether half the teens were from Ireland or California.
There was also a recent contestant on The Chase from Belfast who sounded more like something out of 90210.
https://www.thetimes.co.uk/article/the-yanks-are-coming-but-no-need-to-panic-fl8bq9xpjElsewhere in the culture, several developments have been identified by worried media commentators as further signs of creeping Americanisation, from the popularity of prom dances among secondary school children to the spread of coffee and donut shops. Then there’s the rise in the number of would-be trendy types who seem incapable of communicating in anything other than American teen-speak. The lingo itself is tediously familiar — awesome, dude, etc — but what’s new is the gleeful adoption of fake American accents.