When Hersh breaks into the police car he uses a slimjim on the driver's door which is clearly unlocked already. The sound effect of the door unlocking does not match the lock button which remains completely still in the up position. Hersh then opens the now "unlocked" door.
Dobrica (DO-breetsa) is a Serbian first name, never a surname. And Reese, an intelligence officer who served in Bosnia, would never have mispronounced it "Dobreeka."
It is understandable that Finch would mispronounce the Serbian name Petrovic (PET-rovich) as "Pe-TRO-vich." It's harder to understand why a Kosovo native like Mira would. Especially when she is speaking with Reese, who always pronounces it correctly.