I think the post credits scene was a bridge to why FBI agents Perez and Erickson are suspicious of Hoffman.It would have been better placed in the movie.
Also,I feel it was silly bringing in new detective characters when they could have replaced Gibson with the underused Detective Fisk.A welcome flashback could have involved Evan and his gang assisting Hoffman in abducting the victims of V and VI,presumingly because of evidence he has on them.
The other 2 pigmask people should have taken off their masks to reveal the survivors of the opening trap.That would give that trap a reason within the context of the movie.[/QUOTE]
I quite like that idea, it seems that alot of viewers are unsatisfied that the identity of the other 2 pig mask wearers wasn't disclosed.