Without the spoilers of the episode 8 promo, screenshots and other things. Forget all that. 

Could we identify Red John 100% by only watching the episodes like a regular Mentalist fan?
- We only know for sure that Gale Bertram and Reede Smith of the list are still alive.
- Patrick Jane still thinks Red John isn't caught, so Red John isn't likely dead.
- Someone from the FBI broke Patrick's favourite cup, that bastard. It was the most emotional moment. Dennis Abbot got the remaining plate.
- Patrick shook hands with Red John.
- They found an encrypted list. Probably a list corrupt persons just like HR of the Person of Interest.
- Brett Partridge told to Lisbon TygerTyger
- Reede Smith helped Red John to get FBI classified information
- Patrick walks to a church but why?
- Lorelei Martins told Patrick "I only wonder why the two of you didn't become life-long friends the moment you shook hands."

I wonder.. Lorelei's sister Miranda got killed by Red John. Miranda had a cabin in the woods.
Bob Kirkland's brother Michael allegedly got killed by Red John. Michael had a cabin in the woods.

I also wonder this Red John face on Lisbon, why is it different?

Normal Red John face:
http://static2.wikia.nocookie.net/__cb20091231224606/thementalist/images/c/cb/Red_John_Smiley.png
Red John face on Teresa Lisbon: http://tinyurl.com/kzch2r4
Why are the eyes vertically drawn on Teresa?