How come in the clip show with Mork, Richie and Fonzie remember him? I could be wrong as i havnt seen it in awhile, But wasnt the first one with Mork,Richie's dream?

It was Richies dream. My guess, is that since the first episode was so popular, they decided to bring him back.

Also, I dont think it was a dream. It was SUPPOSED to be, but in the end remember when that guy (Robin Williams) asks for directions? Richie starts freaking out because he was just in the dream. Well, after, you can see Robin outside talking to the sky up in Ork. That lil clip makes me believe its not a dream.