When Louise first meets Sammy Davis Jr.in the hallway, he calls her Mrs. Jefferson, but she hasn't told him her name.
Louise has already met Sammy Davis, Jr. on All in the Family. This is never mentioned.
This episode states that George's flashback with his father takes place in the early 1941. However, in the season 6 episode "Where's Papa?", his father is mentioned to have died in 1939.