Mitchell mentions how it's all "very Chinatown". He refers to the big twist in that classic movie that Faye Dunaway's character is both the mother and sister of her father's grandchild due to incest.
Haley, Alex, Lilly, Joe and Dylan are all absent in it.
Final appearance of Rachel Bay Jones as Dylan's mom Farrah.
The title is a reference to the phrase "three's a crowd".