NBC executives disliked the character of Officer Dewey Dudek and wanted him to be killed off when the show was airing on NBC.
After NBC suddenly canceled the show after season 1, TNT decided to air the show and immediately decided to renew it for a second season.
Bystanders at shooting locations thought that Ben McKenzie had changed careers from acting to law enforcement.
After the first season, NBC renewed the show for a second season but then canceled it before any episodes were aired, because they thought it was "too dark" for its time slot.
When she was given a screenplay detailing a somewhat wild/graphic sex scene, Regina King argued with the producers over it because she didn't feel her character would have sex like that.