Like much of Hollywood Studios this store is designed to look like a back stage area. In this case back stage for the Muppets!
Many of the gags are ones that can be appreciated by young and old, like this one with the sign that states "Keep Workspace Clean" next to the wall of dripping paint brushes.
Many of the signs are anonymous, but a few like these shown above are from known characters like "Rizzo."
If you enjoy the Muppet Show, and who doesn't, you will enjoy spending some time wandering around Stage 1 to read all of the signs and see the various sight gags and props. Believe it or not, this is only a small fraction of all of the special details there is to see in this Muppet centered store.
This is certainly one of those unadvertised benefits that Disney World Guests receive for taking their time to check out all of the details in their surroundings. For the theme park commando, these are some of the little things that you will miss out on.