I'm a die-hard Fringe fan and I have seen every episode. Last nights was good, but not great. The ending was expected, and the very last scene, the "Tulip", was interesting but flawed.
In a second season Fringe, a character played by Peter Weller appears on a train, and the show gets caught in a time-loop like Groundhog day. Some fun things happen and in the end the break the loop with Peter Weller's character supposedly dying, but he sends Dr. Bishop a letter with the drawing of the Tulip inside to let him know he's ok. The problem is that when they break out of the time loop, no one has any memory of it happening, so Dr. Bishop is kinda sorta confused as to where the Tulip came from.
Fast-forward to last night, Dr. Bishop mails the tulip to his son, Peter. As the whole last season "never happened" because time has been reset, Peter too is confused (or should be confused) by the Tulip.
It basically says that even though time has been reset and Walter is gone (into the future and "dead"), that he is either "back here", or in an alternate universe but in "this time", or he found a way to send the letter back in time to Peter, or he knew about everything in advance and sent that letter just a few days ago.
It makes no sense to the character of Peter, but it means everything to the fans of the show. Walter is just being Walter, somewhere.
I'm now suddenly a little sad....
FRINGE: THE MOVIE in 2014!