I'm always changing my scripts ... even after the artwork is finished! Some changes are obviously necessary. Either I've spotted a plot hole or something inconsistent with what I know is going to happen later.
As far as this page is concerned, the one change I've made probably appears very small - the addition of the inverted commas around "costume" in the final panel. To me, though, it just didn't seem right that these guys would refer to their outfits as "costumes". Costumes are something you wear on stage or to a party, not to go into battle. Similarly, they're not "uniforms" (as DC and Marvel have occasionally taken to calling them), since that would imply they're all the same.
I've made other changes along these lines before now - on Page 9 where Stan uses the term "battle-gear" and somewhere in Chapter 4 where Joyce refers to Boo's outfit as her "battle dress". This issue kind of bugs me for some reason and, if I can find a suitable place in the script, I may even add a speech to this effect in a later chapter. I can think of a couple of scenes in which it might fit quite nicely!