In the scene when Will went to tell Vivian and Phil about Carlton, Vivian took off the earring in her right ear to go get Carlton. Later in the scene, Vivian tries to go get Carlton again, and the earring is back on, but the left one is missing.
In the first shot where Will and Jazz walk in the door, Carlton or C-note as he's known in Compton is not there. Then, in the next shot he comes out from the spot easily seen by the camera in that first shot.
When Carlton spends the weekend in Compton, Will tells Vivian and she becomes very upset. In one shot she takes an earring out of her ear. A few shots later Phil tells her to put her earring back in, and the missing earring has switched sides.
During Carlton's weekend in Compton, the posters on the wall of Jazz's apartment change in every shot. They switch walls, go in different orders, and point in different directions.
When Uncle Phil tells Aunt Viv to put her earrings back on, she is missing the left one, and pantomimes putting the right one on.