A few other oddities: babysitters who showed up in one or two strips are linked. Jim is linkless, though Iris isn't. Ted is not listed; neither is Jean. There are a disproportionately high number of people with blond hair. Tiny women and giant men abound -- it's like watching humans with hobbits. I'm sure there are many more strange tendencies that I haven't noticed.
On a slightly different note, I've been reading some of the old strips to try to get a handle on the personalities of characters I want to make into Sims. After reading the strips about the birth of Leah, I couldn't take any more. At least for me, there will be plenty to snark in the years to come.
And here's the link to pictures of my Foobsims: http://cliosims.blogspot.com/2011/08/meet-foobsims.html.