Notice the scene where Baba begins to read Vint's note but Mama and Naomi rip it out of his hands. Naomi reads the first half of the note (which would be on the left hand side of the paper), but she actually ended up with the right hand side, and vice verca with Mama. Either the producers made a mistake, or it could have been another stupid thing Vint does, which is to write the note first and then the salutations second.
(Naomi talks about going out to eat with Vint at Abdul's Garden of Eating)
Mama: Just hold it, toots. Don't book your flying carpet yet. You have not been invited.
Naomi: What are you talking about? My husband won the tickets. Who else is he gonna invite?
Mama: Me! It's a Mother's Day dinner. When it's Bimbo's Day, you can go.
(Vint comes with the note for Mama and Naomi)
Vint: Would you take this note over to the ladies at the Harper table?
Baba: Uh, yes sir. Would you not like to bring it yourself?
Vint: Oh no!
Baba: Oh no? You are very wise.
Vint: Now I lost my train of thought.
Mama: Vinton, that train never left the station
Naomi: Which one of us gets dream dinner at Abdul's?!
Vint: (aggravated about Mama and Naomi arguing over who's going to Abdul's) Okay. You want an answer? You got an answer. This is it: NOBODY IS GOING!!!
Gino Conforti, who played Baba, also played Phillepe from Three's Company, which was also under the direction of Dave Powers. So Dave Powers and Gino Conforti had a mini reunion in this episode.
The episode's title is a reference to the 1967 movie Guess Who's Coming To Dinner, starring Spencer Tracy, Sidney Poitier, and Katharine Hepburn.