When Victoria is talking about Howard Griffin to Jessica, she says that he had been a part-time actor but mostly drove a cab. This recalls Jeff Conaway's character Bobby Wheeler in Taxi (1978), where he was also an aspiring actor who drove a taxi while waiting for his big break.
Angela Lansbury and Harry Guardino starred together in the original cast of Stephen Sondheim's musical Anyone Can Whistle.
The title is based on the common expression: "Birds of a feather flock together." This expression has been around since at least the 16th century as: "Birds of one kind and color flock and fly always together."
The phrase in French is "La Cage aux Folles", which is the title of a play, movie and Broadway musical about a drag queen.
A very young, unknown George Clooney has a bit role as a waiter in the drag club.