Thanks everyone! I did talk to him very briefly over the noon hour and, I hate to say this, he didn't sound too happy. Yikes.
When I asked him how his morning went, I got a sad little 'okay' as a response. He then told me that they'd been wrong in telling him the hours...when they hired him they told him 8-4 if he took a half hour lunch and 8-4:30 if he took an hour lunch, but he just told me that it's actually 4:30 with a half hour lunch and 5:00 if you take an hour. No biggie but I hope that doesn't mean they told him the wrong start time...that would not be a good way to start your first day at a new job!
Hopefully he's just feeing overwhelmed by the new job jitters and will be a bit sunnier this afternoon when he gets home.