Continuity mistake: After Trevor shows Kate and Willie the house for sale sign, Alf is in the kitchen talking into a tape recorder about being blackmailed. There are soda cans to Alf's right next to the recorder and one can of root beer on its side just above the recorder. When it cuts to Kate and Willie walking into the kitchen, the downed can has been moved, and the red can of cola is gone. After Kate says "And it wasn't my mother, either", there's a close up of Alf and the cans are back.
Continuity mistake: After Raquel leaves the Tanners' house after she asks the Tanners about Elvis being next door, Willie walks into the dining room and Alf is sitting at the table with the Elvis sightings book next to him. Throughout the whole "Kings comparison" between Willie and Alf, the book on the table changes positions after every few cuts from Alf to Willie.