When EMTs pick up the injured officer at the beginning, they refer to him as a "red blanket" case. Red blanket treatment of patients has historical roots in pre-WWII emergency medicine practice: a red blanket was placed over a patient triaged as needing rapid transfer to a place of higher-level treatment and attention.
The Chinese characters on the door are indeed the surnames Hong (the one on the left) and Lee (the one on the right).
The stoned driver, played by Foster Brooks, is driving a gold 1969 Ford Fairlane 2 door hardtop with each letter of the word "Ford" on the hood covered by small pieces of silver tape.
Code 2 = urgent, no lights or siren.
484 = theft.