During the run of the show Firefighter Greg Brice was played by a shorter white man wearing glasses. During the promotion ceremony he was played by a taller black man with a mustache.
When the firefighters are being awarded their captain's badges, Craig Brice is a tall African-American man. In previous seasons, the recurring character of paramedic Craig Brice is a slight Caucasian man.
After the promotion ceremony, when Roy & Johnny begin reminiscing, Johnny mentions having been working at 8's when he first learned of the paramedic program. It was well established in the pilot, The Wedsworth-Townsend Act, that he worked from Station 10.