In The Reivers Vera works as one of the prostitutes at Miss Reba's. Because she is away, "visiting her folks up in Paducah," Boon and Lucius stay in her room (99).
In The Reivers the man who owns Coppermine (i.e. Lightning) is named van Tosch. He is originally from Chicago, but on a trip to Memphis decided he liked it so much that he moved to Tennessee and became a breeder of race horses. It is because he is "a foreigner" (281) - i.e. from the North - that he does not behave correctly when his black employee, Bobo, asks for money to help him out of trouble. But the narrative treats him favorably as a friend of both Colonel Linscomb and Grandfather.
In The Reivers Son Thomas is "the youngest driver" who works at Maury Priest's livery stable (4). The "Son" in his name is not connected to any specific parents.
In The Reivers Mr. Rouncewell is an agent for a company that "supplies all the stores in Yoknapatawpha County" with oil (48). Either he or the oil company is also far-sighted enough recently to have added "a special tank of gasoline" to the tanks holding oil (48). His name suggests a connection to "Mrs. Rouncewell's boarding house" (26), where Boon lives, and there are men named Rouncewell in both The Town and The Mansion he could be, or be related to, but the novel does not make any of those connections explicit.
At the end of The Reivers Lucius notes that "Miss Rhodes was going to let me make up the [school] work" he missed while having his adventure in Tennessee (296). She is obviously his teacher - and a very understanding one too.
The "Paul Rainey" whom Lucius mentions in The Reivers was a real Northern millionaire famous for his love of hunting (163). As Lucius notes, he "liked our country enough to use some of [his] Wall Street money" to purchase 11,000 acres of Mississippi land as a hunting preserve (163). Faulkner's father Murry knew him personally.
In The Reivers John Powell is "the head hostler" at the Priest livery stable (4). A hostler is someone who looks after horses. On his twenty-first birthday, as "ineffaceable proof that he was . . . a man" (6), he bought a pistol that he carries to work in his overalls. Having the gun in the stable is against the rules, but he and Maury Priest handle this "moral problem" (6) by ignoring the its existence, "as mutual gentlemen must and should" (8). The novel does not discuss how Powell's race - he is black - might figure in the way he defines 'manhood' or defies the rules.
John Powell's wife is not named in The Reivers, but she is mentioned as having "stitched a neat strong pocket" inside his overalls for the pistol he chooses to carry (7).
Mr. Powell is John Powell's father in The Reivers. John works for him "on the farm" to earn the money with which he buys "a .41 caliber snub-nosed revolver" from him (6).