According to E! Online, Kutcher appeared on screen using a laptop as Walden Schmidt, his new Internet billionaire character. On the character's laptop were stickers for technology companies including Foursquare, Flipboard, Chegg, The Hipmunk and GroupMe.
The stickers make total sense since his character is in that field of work, but CBS didn't approve the advertising.
Kutcher has invested in some of those companies. The network noted the Foursquare connection in the show's credits, per FCC regulations, but the others went without notice.
'Men' creator Chuck Lorre was reportedly OK with the stickers, but CBS wasn't informed and received no compensation for giving those companies prime-time advertising.
"This was not part of any advertising transaction with CBS," a network rep told E!.
Look for the stickers to be blurred in reruns of the show.
Below, check out our interview with the cast of 'Two and a Half Men' and a catch-up guide for this fall's returning shows!