Revealing mistake: As Harm & Mac are returning to the US, we are told they are flying out of London Heathrow. But the stock footage of an airport used is actually London Gatwick, identified by its distinctive control tower, and not Heathrow.
Revealing mistake: When Harm kills a poacher hunting them, they take his rifle but the ammunition he has for the rifle is shotgun shells.
Revealing mistake: The municipal court-room used for the Chief's arraignment hearing looks amazingly similar to the military court-room at JAG. Or maybe, the same architect of the Navy's court-room was retained by the District as well.
Answer: Officially, the individual has been ordered to attend, failing to could be interpreted as either, Failure to follow orders, dereliction of duty, going AWOL, or even desertion. It would depend on the underlying reason as to why the person doesn't appear.