I bought the air horn before I needed it and then I ended up doing the revenge prank before the initial prank. So that was a bit confusing. I just thought that I might as well buy up all the other stuff in the store so that I would have it whenever I needed it, but I guess that threw that one quest order out of whack. I still got all three pranks eventually, so I don't think I broke the save or anything.
I like the game for the most part, but I hate that we have to be nice to Cara and Hendrix. I had a one scene where I got to insult Cara a bit, but I was forced to be friends with Hendrix even though he straight up assaulted us without provocation. What's up with that?