Continuity mistake: When they try to land the C130 on the aircraft carrier, the co-pilot says that they don't have the right landing gear down, so she goes to the back to instruct one of the passengers how to lower the gear manually. The problem is that they lower the left gear, which was already down.
Continuity mistake: When Mac talks to Webb at the end of the episode, she remains still on the couch, but then her hands suddenly appear up in front of her face. (00:41:35)
Continuity mistake: When Admiral Chegwidden hands Petty Officer Coates a dress of hers he found in the galley, Coates' grip on the hanger changes between shots. (00:09:35)
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.