I've been playing with the pack since its release and it is so much fun; I'm quite delighted with it. However, like others, I have noticed a couple of glitches. On the Easter Holiday, in the Spring, the "Hunt for Egg" tradition was borked. My sims hunted and hunted, finding every new special egg (as well as lots of plain eggs) now in the game, but the tradition was never fulfilled. They also failed to find any decorative eggs and I had to get them out of Buydebug (which luckily did complete the requirement but was so tedious).
The other glitch had to do with two hens, at two different times, seeming to get stuck in the coop while also becoming invisible or unselectable or something. Both times I had ordered the hens into the coop to sit on a hatchable egg. A few hours later I went back and the hens were nowhere to be found, yet the game was reporting they were miserable. I checked on the chickens that were in the coop, but these missing hens were not among them. Then I tried calling any outside or roaming chickens in but they also did not appear then and were nowhere in evidence. Both times this happened I finally went in desperation to Manage Worlds, and then reentered the household.
On returning, they were indeed each in the coop, but their stats were incredibly low (Unhappy, Dirty, and Starving). The coop, which was in a very clean state originally (my sims keep it very clean normally and the worst it ever gets is slightly dirty), had become a disaster area all of a sudden, and was now completely dirty with that ugly stinky green mist surrounding it. Luckily the two hens were easily restored to health with some attentive hand feeding and socializing. I narrowly avoided having them leave, though, so it was a very annoying bug, even if fixable.