1) If Delahunt is an undercover for the Boston PD (as is stated in the newscast), why would he have participated in Queenan's murder? Queenan, right before being tossed off the building, unclips his holster and his badge is plainly visible on his belt.
2) What information does Costigan have in the envelope that would prove Sullivan to be the mole in the department? This occurs before he has the recordings from Costello's lawyer, and he already has no access to any of Queenan's files since he goes to ground after fleeing the police station. It would seem to just be a lot of allegations without support, yet there has to be something in the envelope that conclusively would show Sullivan's guilt (what else would be in there?).





