[ul]The beckoning cat controls the lights
Only people who live in or have visited Oreki's house recently would know this
When the table was cleaned, the beckoning cat was left there, because whoever decided it should be left there knew it being on the table was more important than even the TV remote
Therefore, one or more of the people currently present have visited his house recently, and the rest do not know
Oreki (and possibly the person or people who have visited before) do not want the rest to know[/ul]