Kelso asks Annette if she knows "The Devil Went Down To Georgia" when she's singing at the post-funeral reception. That song appeared on "Million Mile Reflections" (Charlie Daniels) and was released in 1979. However, the license plate validation tag at the beginning of the episode says "78".
There's no sign or mention of Kitty's sister, Paula, at her father's funeral.
There's no sign or mention of Laurie at her grandfather's funeral.