One of the writers for the series is from the village of Lahinch which was the primary filming location. The producers picked the location without knowing it was her hometown. Also note the village is Lahinch not Lehinch, the "e" spelling was inflicted on the village by the national roads authority about a decade ago along with changing the spellings of numerous other towns and villages around Ireland but the most extreme examples all happened in county Clare. So when the filming locations are listed the spellings may or may not match those used by the local residents.
The filming of the first season was disrupted by Covid with the early filming taking place in February 2020 when the west of Ireland was lashed by numerous severe storms, they resumed filming in September of 2020 after peak tourist season had passed and they could regain access to the local properties used in the show.