"Köttbullediamanten" is Swedish for "the meatball diamond."
When Kevin and Raymond are discussing squash with Boyle in the break room, there is a blackboard over Raymond's shoulder next to the door. You can see that it has "stop stealing Terry's yogurt" written on it.
Melissa Fumero was pregnant during filming and while most of the time she keeps her belly hidden, it's noticeable during her dance scene in the blue starfield dress.
The name of the diamond thief Jake and Rosa catch on the fish market is Karl Ove. The name of the swedish detective is Knausgard. Karl Ove Knausgard - norwegian author known for autobiogtaphical novels - My Struggle.