There are several African American students mixed in with white students in the classroom; and white and African American adults sit near one another at the town-hall meeting and mingle afterward. In the 1960s this would not have been possible or allowed due to the fact that segregation was still in effect at the time, although this was slowly changing.
In "A Walton Thanksgiving Reunion," John's hair was completely white; here it's more brown than white.
Janet is still wearing her engagement ring, although it's customary for the bride to remove it before the wedding.
Grandma Walton and the Baldwin sisters would more than likely be dead by the time of this story.
The Baldwin ladies said that they whipped up a batch of the recipe to take to New York as a wedding gift for John-Boy and Janet, but how could they have possibly done that if the sheriff confiscated their father's recipe machine during the raid in "A Walton Thanksgiving Reunion"?