Dexter and Miguel Prado walk into Courtroom 103. The number 103 shows up multiple times in season one. This is a reference to the date, October 3rd, 1973, which Dexter and Brian Moser (Ice Truck Killer) were found after their mother and three drug dealers were murdered. This is the date both Dexter and Brian were "born" as serial killers. 103 is also a reference to Sergeant James Doakes, who was framed by Dexter as the Bay Harbor Butcher. Doakes was born on October 3rd, 1962.
The title "Si se puede" translates to "Yes you can."