It appeared to be a nod to Pinkett Smith's shaved head, which prompted Smith's outburst on the Oscars stage.
Rock was presenting the award for best documentary feature when he made a joke about Pinkett Smith's bald head.
"Can't wait for 'G.I. Jane 2,'" Rock said in reference to the 1997 movie "G.I. Jane," in which Demi Moore shaves her head bald.
After appearing to laugh, Smith then walked on stage and took a swing at Rock. He then walked back to his seat next to his wife and yelled to Rock: "Keep my wife's name out of your fucking mouth!"
The moment was televised to millions of viewers around the world.