Director Vic Sarin reported that Connie Nielsen was so immersed into her role that she spent the entire 28-day shoot speaking with an Irish accent, even when off-set.
Spectacular rainbows and double rainbows are a common occurrence in the part of Ireland where the film was shot.
The monument of standing stones on the island was built for the film. Some of the huge 'stones' were made from concrete, others from polystyrene. However, many tourists to the area mistook the monument for a real stone age site.
The actors intentionally speak a very toned down Donegal accent, because international audiences would not understand the much stronger genuine accent spoken by the islanders off the Donegal coast.
Maire and Alec's cottage is a construction of scaffolding and timber, which had to be built for the film because no suitable house could be found in the location.