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Two things:
1.) A DemocraticUnderground poster with the handle sfexpat2000 was the first person on the web, to the best of my knowledge, which noticed this time discrepancy.
Here's the original thread:
http://www.democraticunderground.com/discuss/duboard.php?az=show_mesg&forum=389&topic_id=3754666&mesg_id=3754666
2.) As for Dr. Ivins driving later that night:
Perhaps this is why the FBI worked so hard on Ivins children. If his wife and both children swear that Dad came home that night, watched TV and went to bed, I guess that gives him a pretty good alibi.
So, if you're the FBI and you think the kids are lying to cover for Dad, you show them pictures of the antrax victims or offer sports cars to get them to change their story.