This was a good show, the characters were likeable and very cool aliens. Drinking the rotten milk was kind of gross as well as putting an alien in saltwater. I believe that Gary Graham played the main human character, I haven't seen him in anything since. I was disappointed when this show went off the air.
The reason they changed his name to George was an "in" joke. Originally they wanted Francisco's name to be George Jetson. So they came up with the idea that Matt wouldn't want to have a partner named Sam Francisco and Matt called him George instead.