So!
Years ago, I had come across this thread, which at one time had provided what I assume was a link to a blooper reel from the film The Five Year Engagement. However, the link's been broken for some time now -- and rather than try and necro that thread again, I figured I would start anew and ask if anyone knows if there's been anything from her beyond just this gag reel. Or, conversely, if anyone knows where I can find the gag reel itself.
The only other thing I myself have been able to find is this interview from a while back. It doesn't appear to have an audiovisual counterpart, but just knowing that she apologized for sneezing in the middle of being interviewed is lovely.