Yes, it is a real Moon Tree and it's growing right here in the Lone Star State. The Moon Trees were a joint effort between NASA and the U.S. Forrest Service.
The Munster Mansion does exist and it's in Waxahachie, Texas. To get to tour the mansion, one must book in advance and tours are for parties of four or more. Enjoy a walk back in time.
During two separate interviews, the actor who played James Dutton described what it was like to prepare for and then be a part of the show's desperate final moments.