I hadn't thought of that, but since Al was on tour, the Hummer would have been provided (as stipulated in the tour rider) by the concert promoter.
So what's the situation here? Al's tired (he's been on a pretty hectic touring schedule). He's been stuck in traffic, which has to be frustrating since he knows he's inconveniencing/disappointing these guys he's promised to see for an interview, and Al hates inconveniencing/disappointing People He's Made Promises To. Then these PHMPT are obviously nervous, but instead of admitting it (which would have gotten a sincere, putting-at-ease reaction from Al, it always does) they cover it up by trying to wisecrack wiser and crackier than Al, who probably did not enjoy this pressure to perform at all, especially since he's not familiar with the publication and probably has no idea what kind of "performance" they're expecting. They were lucky to get even a modicum of "zany wacky funster" out of him. And lastly, every minute Al spends with these guys is a minute he's not spending with Suzanne and Nina in a very beautiful and historic hotel. Sheesh.
This is what they should have done:
1) Commiserated on the traffic & apologized for the wrong directions. This takes the "guilt trip" off Al and puts it back where it belongs: on Circumstances Beyond Our Control and their own directional cluelessness.
2) Gone ahead and ADMITTED that they've been big-time fans for a long time (with an example or two, maybe) and that they're nervous. This lets Al know that they're on his side, aren't looking to score "coolness points" at his expense by zinging him in the article (which they did anyway, kind of, but I think that was mostly just a reaction to their feeling they'd been such dweebs-- and they had). "Boggling star-struck fan" is OK; that's a category Al's familiar with, he can deal, and in fact, as lots of us know, he has a real knack for pulling fans out of boggle-mode quite expeditiously.
3) Fercryinoutloud, let Al get a word in edgewise! Ask him about Frank Zappa and then SHUT UP AND LISTEN.
Man, I hate it when I see somebody blow a perfectly good opportunity to get a non-boilerplate interview from Al.

"Weird Al" has a charisma that's all his own. The awkward, the misshapen, the socially inept flock to his banner.