It wouldn't surprise me. Whoever writes their websites does a VERY poor job, regardless.
I'm a web developer by hobby/side gig. I test all my sites in Internet Explorer, Firefox, and Google Chrome (and have others test them in Mac and Unix browsers). Everything I write is XHTML and cross-platform compliant.
However, Disney's sites often fail in at least one of the three main browsers, all the time. I get a kick out of looking at their web code, because I'll often see comments left in the code by the developers saying things like, "We'll get to this in the next phase" or "Buggy in Firefox".
Also, I think they win the trophy for the most javascript and flash used on a single web page. It's no wonder their pages take so long to load - they're pulling scripts, images and content from about 30 different servers all at once.
So, it doesn't surprise me that their actual content is wrong - since the pages themselves are deplorable, at best.