Susan: (from outside the door) Knock knock.
Mork: Who's there?
Mork: Susan who?
Susan: Susan Taylor.
Mork: That wasn't a very good knock knock joke.
Susan: I only eat white meat.
Mork: I guess we'll have to have a Caucasian turkey then.
Some versions of the Pilot do not have Mork reporting to Orson at the end (though it could be simply where they are edited for time). On various two-part stories (including the 2-part version of the Pilot), Mork does not report to Orson at the end of part one.
During the end credits still pictures are usually the backgroud for the credits. This time closing credits are over a scene of Mork coming downstairs to sit by the Christmas Tree.
I believe this is the only time Mork did not report to Orson at the end of the episode.