- Mireille Enos did not watch the Danish original, "Forbrydelsen" (2007), before filming this series.
- The Danish title of the original series, "Forbrydelsen", actually translates to "The Crime" - not "The Killing" as it was called in the UK.
- AMC canceled the series after the second season. A few months later, Fox Television Studios reached a deal with Netflix to co-produce the series with AMC and revive the series for a third season.
- SPOILER: The surveillance video at the end gives 10/6/10 as the day Rosie Larson died.
- Dep. Attorney Christina Niilsen is played by Sofie Gråbøl, the actress who plays the lead character Sarah Lund in the original Danish series, which this remake is based upon.
- Dep. Attorney Christina Niilsen is played by Danish actress Sofie Gråbøl who played the leading detective Sarah Lund in the original Danish series.

