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There are many and I'm sure I won't be able to recall more than I can think of, but...
The emergence of a real running game. It made a tremendous difference this year, and likely will for at least the short-term future.
Finally having a season of relatively good health overall. Definitely want to see that continue going forward.
Packers management focus returned to the team and away from "non-football operations".
FA acquisitions were a good, if not great, ROI. They may not have hit them all, but the ones they did were HRs. In any case, every single one of them were miles ahead of the players they replaced.
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Passing game was rather disappointing. We can see what they are capable of when it clicks, but it largely didn't over the season. I don't think we are as bad as what some others think at WR and TE, but something has to change. Start by trimming the fat at TE; too many players producing way too little.
Also disappointed in the OL play when matched up against the stronger defenses. Whatever the answer to that is will have to be found before we can compete with teams like the 49ers.
Rush defense. Started out bad, finished bad. We've got some horses, but apparently not enough of them. Speaking of games being won/lost in the trenches, the Packers won't be able to take the next step until that's solved.
Special Teams. Unpossible to think it's a problem every year, yet it is.
Overall, it was a pressure-packed season with plenty of adversity, but it was incredibly fun, exciting, and enjoyable.
I can't wait to see what next season brings!