When the fans went to start on the second poster I think they were stuck for some inspiration. I think someone in the audience suggested Rocky Horror and pulled up an image on a phone for them to work from.
(click any image to enlarge)
above :: If you click on the image above you can see the photo the fans are working from on the phone.
above :: A fan offers Misha a tissue to wipe the lipstick off that he had put on to "decorate" the Sam & Dean poster himself.