In this episode, Ross has finally settled into his new apartment across the street from Monica and Rachel's apartment. He attempts to be entertaining Monica and Joey by immitating various activities; i.e. surfing and shark attack.
While watching him do this, Joey sees a hot girl in Ross' building. He goes over to the building but ends up at Ross' apartment instead of at the hot girl's. So he looks out Monica's window again to re-count the windows to find her apartment and comments to Monica that Ross is going his "watching tv bit." The camera pans over to Ross where he is sitting on the couch, occasionally lifting his remote as if to change channels. The camera then shows Ross' tv to show that he is actually not watching tv because the television set is not on. If you look closely on the black screen of the tv, you can see the reflection of Ross' couch. The couch is empty. If Ross was sitting on the couch supposedly watching tv, shouldn't he be seen in the tv's reflection?? I think so. Instead there is an empty couch!! Someone should have caught this!