I thought I saw the pattern of the Dreamatorium when Jeff teleported into the real timeline, so that's why I thought he and Abed were pretending. It seemed easy to have it all in Jeff's head, but they couldn't have made it actually real. Or maybe they could have, I don't know
For an episode, there were a good amount of jokes. The dean's graduation gown, Troy forgetting the soda "Must I bear this cross forever!"
The Cape season 3 existing... Chang yelling "friendship" when he got hit
We had the meta jokes "We finally found a way to make paintball cool again"... Pierce saying how it was just Christmas yet now it's warm
Annie looked amazing in that red dress
Jeff's final speech was heartfelt and short and sweet. The last bit around the table felt a bit flat as they were making sure if they got renewed they had an excuse for Jeff still hanging around
I don't know how I would have ended it, so that's not a huge issue.
I hope this isn't the last of the show because there's been enough positive episodes or ideas to warrant another 13 episodes. This season wasn't as terrible as I feared and it wasn't as different as I might have hoped. They held on to the spirit of Community with theme episodes and high concept stuff, but without Harmon you just can't replicate that. If they didn't try those things, people would say Community isn't the same and they turned their back on their fans... but when trying and failing, then you just seem like cheap imitators. I think a happy medium of making it a "friends hangout show" and the occasional nod to the weird and wacky Community would be a solid 5th season.
If it's the final episode, I'll miss it tremendously.