Ok... so here's a wee verstion of the first picture...
Look for the Bert!
Look here... here... and here
Here are three links to where the bert pic has shown up... thanks to bkw for the reference. Now one of pic's look like it's doctored to me... the poster is infront of the head of the guy on the left side of the picture which doesn't necessarily look right... but still... it's a great joke if that's what it is... :D