Seriously, you seem to playing this out on a personal level that is going way beyond what happened at this Dominoes.
Ordering a pizza during business hours isn't a dick move, by any stretch of the imagination. I don't know where you're getting this thing of the customer having a dickish attitude, from ordering a pizza near closing. Or saying that the nurses are of the opinion that working at Dominos is menial.
I'm assuming that you've worked in the food industry. I'm pretty sure that if you closed, you pretty much NEVER closed right when business hours were over. You were scheduled for 1 - 1.5 hours past closing to be able to do the closing duties. This would go slightly longer if a patron was there up until closing, or the kitchen stayed open past regular closing shift.
Did it suck? Sure. But you don't trip because it's part of the job. If it didn't happen, you might be able to check out earlier. Score!
But you wouldn't do what that Dominoes employee did, because that was at LEAST going to get written up, if not fired.