It's stated in this episode that Liam's Black lineage comes from Monica's side of the family, however back in Season 1, after a paternity test proves that Frank was in fact Liam's father, it was revealed that Franks grandmother had slept with a Black man.
The security guard mentions a time of 'oh-sixteen-hundred' (01600). Military time goes from oh-nine hundred (0900) to ten-hundred (1000) and so on.