I haven't been staying current with The Flash, but knowing that Grant Gustin had been on Glee and seeing they did a musical episode of The Flash, I had to check it out. I wasn't surprised that Darren Criss was in it, but pleasantly surprised: (spoilers ahead):

In the dream world, Iris had two gay dads, one of whom was played by Victor Garber, the gay actor who plays Stein on Legends of Tomorrow. Her boyfriend's father was played by John Barrowman, another gay actor. It gives a double meaning to "two gay dads" in the episode. (The third dad, Stein's husband, was played by regular Jesse L. Martin.)

And if you're not familiar with Glee, both Grant Gustin and Darren Criss played gay characters.

Do little things like this on TV delight you? It's not much, but it's fun. In spite of the episode being controversial for being a musical.