In the kitchen, when Goodrich puts his hand on Carl's shoulder, Carl's back is to him. In the next shot, they face each other.
Buddy Goodrich arrived at the Winslow residence shortly after his arrest, but there is no indication of how he obtained Carl's home address. To begin with, many officers don't list their home address or phone numbers in the phone book to avoid having people they deal with from obtaining this information, particularly to protect themselves and their families from retaliation. The police department would have been forbidden from disclosing his home address as well.