In this episode, the girls meet "Jake the Caterer". Blanche becomes infatuated with him. In thier first encounter with Jake, in the living room, when Blanche takes him by the hand off the couch and asks him(while next to the front door) when she can come over and sample his selection... On the inside of the front door, at about "neck" level with the actors, you can see there looks like theres an "exclamation point" embedded into the door. At no time can you see it better than when Blanche is talking to Jake right in front of it before leaving, but it's there throughout. Not sure if it's there throughout the series, and have yet to find an explanation.