Its John Waynes El Dorado. When Mississippi goes outside to go across the street, Bull tells him if hes not back in 5 minutes hes coming after him…its a wanted poster!
In Series 5, second to the last episode (Hulu)
there is an Ernest Testa Wanted poster on the wall in the sheriff’s office in the Dick Van Dyke Show.
One of the Dick Van Dyke writers must have liked Ernest.