According to Stan Berkowitz: "Chemistry" is a metaphor for marriage, specifically, the way people change once you've been intimate with them for a while. Since many of you reading this are too young to relate to being married, trying looking at it the other way: since you know your parents intimately, try going to work with them some time; you'll see an entirely different person

"Chemistry" was exaggerated, of course, but sometimes you have to do that to make your point. One side note: in the first draft, there was no mention of pheromones; Bruce fell for his fiancée because she fit in with him perfectly; she did whatever he wanted her to do, and never gave him any problems. But real relationships aren't that easy, nor should they be; if you get whatever you want all the time, you don't grow, and (in the real world, anyway) you're pretty much guaranteed to have a mate who won't be there very long. (edit) This marks the final appearance of Batgirl/Barbara Gordon on the series. (edit) Dick Grayson appears in this episode, while Nightwing does not. (edit) Bullock does not appear in this episode. Gordon appears but has no dialogue. (edit)

Dick: I give it a month.
Barbara: You don't think the marriage will last?
Dick: Not that. I'm saying he'll have the costume back on in a month. (edit)

Trivia: This is the second time that Bruce Wayne is engaged. The first was in the Batman animated movie Mask of the Phantasm when Bruce was briefly engaged to Andrea Beaumont. (edit)

This episode does not have any allusions. Add some now!