(c)1989 NBC–Comcast; NFL Part two. PERSONNEL: Host: Bob Costas Analyst: Don Shula (who was pretty much a part-time NBC employee during the late 1980s considering the Dolphins’ 1986-89 playoff drought) Reporters: Paul Maguire (49ers); Gayle Gardner (Bengals); Jim Gray (roving) Talent Challenge (from Miami Seaquarium): Ahmad Rashad and John Candy (who had taken a break from shooting the movie “Uncl…