Ausiello reported this two weeks ago:
If you blink while watching Worst Week's Feb. 9 season finale there's a very good chance you'll miss Zach Braff, who makes a split-second cameo. CBS' freshman comedy was shooting on Scrubs' vacant hospital set the same day Braff was there looping dialogue for an upcoming episode. "He appears very briefly in the background of a scene," says a source. "He just did it for fun."
But with President Obama's first news conference last night, 'Worst Week' got bumped, so hopefully that makes up for the fact that I forgot to alert you in the first place about this possible crossover - an epic of trivial proportions.