The framing of the Burger Chicken is seems almost too obvious when its pointed out but I didnt see it first time thru either. I read some notes that one of the producers had made and he mentioned that they tried to show right from the beginning that D'Angelo was not respected by the senior enforcers.
So many stories they tell are true. The story Freamon tells in episode four of the old lady whos murder he investigated that got him transferred to Pawn shop division for 13 years ( and four months

) is also a true story.
I'm gonna finish the first series tonight. Got right back into it really quickly.