I actually just went ahead and watched another ride through of WDW's mansion and forgot that the host says, "Every room has wall to wall creeps." at this moment, too.
In this new context, "creeps" could be taken quite literally and be seen as a form of addressing the Hatbox ghost, albeit indirectly. Since the scene will literally now be filled with the Hatbox ghost, candelabra ghost and possessed knight
Sure. If referencing the wall to wall carpet wordplay justifies it. I think it's more about the eyes on the wall you pass painted and lit.
We can retcon and justify, but it's not what the line was intended for in the carefully.paced attraction.