OK, here goes what I saw. I haven't had the time to put things down clearly, so I may jump around a bit:
Pre-game - Myself and the guys that I go to the game with decided that the game was going to be a blowout, but we couldn't decide who was going to be on the winning end. It could have been either the Lions or the Packers in our mind.
The stadium - I was surprised to not see as many Packer fans as I thought there would be. Sure, there were a lot, but they have always traveled well. There were not the huge groups throughout the stadium and rarely did I hear any real loud cheering from them. The place was for the most part full, but the club level seats were very empty (those do not count for the blackout).
The game - It was nice to see that they showed up for the first series, which had me a little excited that we may be on the winning end. The D-line started the game real good getting pressure. The LBs were making tackles and it was at the LOS, not 10 yards down field. The Lions showed up for the game and GB would be put in 3rd and longs almost every set of downs and end up converting a huge play. Typical Lions. The Lions were able to move the ball at times, while other drives stalled. Kitna was throwing behind his WRs all game. If he hits a couple in stride, it could have been a different game. This in the end is what I thought caused us to lose the game. During the comeback, we had to settle for FGs instead of TDs. It has happened before, most notably in the GB game last year. If we can actually put the ball in the end zone, I think we have a chance

Other contributing factors, obviously the Kitna picks 6(both of them), the defense giving up the 3rd and long after we took the lead, with the long pass to Jennings.
I was surprised to see how many people were still in the stands until the 4th Q. There were some boos throughout the game, but the first Fire Millen chants came just before half-time. They got really loud just before the comeback, with about 3 minutes to go in the 3rd.
Like I mentioned, Kitna had a lot of bad passes, some that ended up being caught, but could have gone on for bigger gains. The TD to CJ2 was behind him. The WRs did have a problem getting open, but some of that may have also been the O-line. Early during one series, Kitna was sacked, but I was watching the WRs, as soon as they got out 5 yards I heard the whistle and Kitna was taken down, they didn't even have a chance to go into their breaks.
Just when you think they have a chance and have turned a corner they go and rip your heart out of your chest. Right after they took the lead, we all looked at each other, with the crowd going crazy and said, just wait, there is still a lot of game to be played, and unfortunately it happened again.