This is actually the first film in the series, followed by Brandbilen som försvann (1993). They were released out of order as this was released straight to video while that premiered in theaters. Also, IMDb's follows/followed by order of this and the third film Polis polis potatismos (1993) is reversed, but somehow can't be corrected as they were released on the same day.
Lennart Kollberg stops for burgers at the "Big Burger" restaurant, right next to Odenplan, which is the same place where there were lots of commotion including a police helicopter shot down, in the previous Swedish Beck movie adaption, O Assassino no Telhado (1976).