In its original American broadcast , " Training Day " was viewed by an estimated 7 @.@ 871 million viewers and received a 4 @.@ 0 rating / 11 % share among adults between the ages of 18 and 49 . This means that it was seen by 4 @.@ 0 % of all 18- to 49 @-@ year @-@ olds , and 11 % of all 18- to 49 @-@ year @-@ olds watching television at the time of the broadcast . This marked a rise in the ratings from the previous episode , " Garage Sale " , which can be attributed to Ferrell 's guest appearance . The episode ranked first in its timeslot , beating the Fox crime drama Bones , which scored a 3 @.@ 5 / 10 percent relating in the 18 @-@ 49 demographic ; a rerun of the ABC medical drama Grey 's Anatomy and a rerun of the CBS crime drama CSI : Crime Scene Investigation .