Fox originally planned to cast an all-new all-American cast for Gracepoint, using none of the actors from the British original. However they allowed David Tennant to audition for the role of Carver (the role based on the role he played in Broadchurch) and he "blew away the competition" winning the role over all the American actors who also auditioned for Carver, even though Tennant had auditioned in an accent that was not his own.
Is a remake of the British show Broadchurch, which David Tennant was also in.
Gracepoint is a ten-episode series whereas Broadchurch, the British show it is based on, was eight-episodes. The reason for the extra two episodes is because Broadchurch was originally created to be ten episodes long. However the British network ITV would only commission eight episodes, forcing the creators to cut two episodes. Fox allowed the creators free choice over how many episodes Gracepoint would be, so they chose to restore the missing two episodes.
Although the story is based in California, it was actually filmed in Victoria, British Columbia, Canada.
There was actually a website that the show created where fans could vote on who they think killed Danny and it would display who was the lead suspect after each episode aired.