What flips me is that 'Cathy' did a joke about the Transformers back in the eighties when they first came out. I don't think Lynn heard of them till last year.
ETA: I begin to wonder if I'm off-base in my premise here. If you read this right, it almost looks as if Lynn is trying to show us that Randace's non-traditional relationship is about to lose its spark, so to speak. As howtheduck mentioned on his blog, they've gone from 'carefree' to 'bickering old married couple' since we've seen them last. This tells me that Lynn is showing us that cohabitation doesn't work, that Liz will be set for life once she ties the knot his August.