Deliberate mistake: The way diplomatic immunity is depicted in the movie is extremely inaccurate. While technically a sufficiently ranking diplomat could perform the acts shown in the movie without being subject to arrest, their home government would be requested to turn the diplomats over for trial, or the diplomat would be declared persona non grata and expelled from the country. A drug smuggling ring and murdering multiple policemen is far, far more serious than actual crimes that diplomats have been expelled (or handed over for trial) for in the real world. Additionally, the consul general and his officers would not be considered diplomats. They would only have limited consular immunity with regards to "official acts" in the course of consular business.
Rudd: Now we DO have a serious diplomatic situation here, which I will be taking up with your state department first thing in the morning.
Riggs: Whoa, you got me quakin' in my boots, but I'm still gonna bring you down.
Rudd: My dear officer, you could not even give me a parking ticket!