Airships in the sky seem to be the hallmark of alternate realities. Having lots of them in our sky could confuse things.
I think the point of that slide is to show that the war is complex and judging by the laughing it worked. It's basically like Primer in this XKCD comic, the point is not is understand the picture but to see that its very complex.
Maybe if you use IE and Silverlight on a Windows PC. Flash on Chrome in a Linux machine is going cost you!
Eolas' claims have been contested by Pei-Yuan Wei, developer of the earlier Viola browser. This claim is supported by Sir Tim Berners-Lee and other Web developers."