the last sneak peek from CBS
http://www.spoilertv.com/2013/11/the-mentalist-episode-607-great-red_13.html
look carefully at haffner

first he was sitting on Stiles right hand and than on his left next to the door

After whay teresa told him about Jane thinking he's RJ he tries to escape when PJ turns his back but Patrick saw him and shot to make him sitdown again, that was the shot we heard before lisbon came and everything exploded.

when first we saw the five suspects sitting McAllister had his hat with him on the couch with his hand always on it. when PJ asked him to move with others the hat remains in it's place.
was there anything Inside it,, after all why bring his hat with him he could've kept it in his car.

in E08 we'll see a Young actor Nick nordella,, i think hell play Mcallister's role,, the resemblance is too much, secially the dimple chin they both have. no any other blue eyed suspect has it.

i'll keep my theory that this Young actor will play a role in PJ's past,