In the scene where Bubba shows Olga how he makes a bologna sandwich, when Olga hold up the slice of meat the Oscar Mayer's logo is pressed into the slice.
This episode (aired 12 Dec 1987) takes place approximately two years before the fall of the Berlin Wall (9 Nov 1989) & four years before the fall of the Soviet Union(dissolved 25 Dec 1991).
At the beginning of the episode, the family is seen playing the board game version of The $25,000 Pyramid (1982). Vicki Lawrence, who plays Mama, was a frequent guest on "The 25,000 Pyramid" and The $100,000 Pyramid (1985) in the 80's, in fact she's the most frequent female guest on the former with 88 appearances on the CBS Daytime version.