While released first this is actually the second film in the 2005-2006 series, following Borkmann's Point (2005). They were released out of order as this premiered in theaters while that was released straight to video. Also, IMDb's follows/followed by order of Borkmann's Point (2005) and the third film Münsters fall (2005) is reversed, but somehow can't be corrected as those were released on the same day.
Chatarina Larsson who plays Van Veeteren's partner Ulrike Fremdli played lawyer Lena Moltke in Återkomsten (2001).