Actor Allusion: In the first two seasons, Martin always kept a framed poster of Do the Right Thing in his living room. It was one of Lawrence's first film roles and he played Cee.
When Christopher "Kid" Reid of Kid n Play and House Party fame guest starred, Sheneneh begs him to kiss her "like the way he did with that light-skinned girl in House Party," referring to Campbell of course.
Marla Gibbs once guest starred as an inept new housekeeper. Her sassy attitude was similar to her character on The Jeffersons, and when she first appeared at Martin and Gina's door, the couple said "You got the wrong apartment, you probably want 227" (another sitcom she starred in) and "You'll have to move on up" (or something along those lines).
And don't forget Tommy, played by Thomas Mikal Ford.
Hey, It's That Guy!: Two Saturday Night Live cast members were on this show: Garrett Morris (the first black male cast member from the "Not Ready For Primetime" era) played Martin's boss back when he worked at the radio station and Tracy Morgan (from both SNL and 30Rock) played a crooked street dealer named Hustle Man.
Carl Anthony Payne II played Cockroach in the first few seasons of The Cosby Show.
Romance on the Set: Averted. Lawrence wanted this with his costar, but Campbell felt quite differently, leading to the tensions mentioned above.
It has also been said that there was tension due to her new husband at the time, Duane Martin, being jealous of Lawrence and Campbell on the set and not liking him (he also wanted to be on the show but Lawrence said no). None of the other cast members supported her allegations, though. It does seem like something was going on between them at some point, though. She is very close to him at 2:55 of that clip.
Word of Saint Paul: The actor later revealed that Tommy works in the National African American Tobacco Prevention Network.