Detective Sanchez wears a coverall with an OPG shoulder patch when pretending to be a garage employee returning a car to a suspect. OPG are the Official Police Garages of the LAPD.
The issue of having a hyphenated last name for people from Latin America would already be known by the police who would have dealt with that on a daily basis. This is a instance where characters have to play dumb so that someone can explain it for the benefit of the audience.