 " Training Day " received mixed reviews from television critics , with many commenting on Ferrell 's appearance . The episode was also viewed by 4 @.@ 16 million viewers and received a 4 @.@ 0 / 11 percent rating among adults between the ages of 18 and 49 , ranking first in its timeslot . The episode ultimately ranked as the highest @-@ rated NBC series of the night . 
