Continuity mistake: After Big Bud punches Dobie, younger Bud is visible having run around a corner to help break up the fight. In the next shot, Bud is nowhere to be seen and he runs around the corner again. (00:12:30)
Audio problem: When Mikey asks Bud if he can stay at the party in the bar, his mouth isn't in sync with the words. (00:35:25)
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.