How'd you know that?
If your character didn't possess information before entering the City and hasn't legitimately received it throughout game-play (be it either directly or through logical inferences)? You are not allowed to assume it. Even when you're drawing said inferences/conclusions, if you're dealing with sensitive things concerning someone else's character, it's good form to OOCly secure their approval. No one's going to raise an eyebrow if your character A realizes that if char B has been throwing money left and right, then they probably have quite a bit of it – however, they might be a weee uncomfortable if, from this same amount of information, your character conveniently realizes that it's all one giant money scam on B's behalf.
A particularly unsavory breed of infomodding is Fourth Walling. Let's face it: we all know a lot of fandoms, and with Poly exposure? We're only going to learn more. Unfortunately, what you know should never be a 100% match with what your character knows.
So, for instance, having a character randomly pop up and tell yours, "WOW I KNOW YOU, YOU'RE FROM THAT MOVIE – " just because they come from a time when the other char's canon would be available in viewable format? Not cool. If you want to assume that your character has been exposed to someone else's canon this way, please talk to the player of the canon in question.
Even if, canonically, your char possesses information about some particular canon? ( Most series throw in a Star Wars joke at one point, y'all.) Please defer from referencing it unless you have the abovementioned player approval. It's… just not nice for most people involved, if you don't.
So does this mean no more cultural references? Not really, no. It does mean, "Tread lightly with the canons of characters involved in present gameplay."
Likewise, it is not the best of ideas to constantly tailor your character's set of skills in order to suit a particular situation – not without the proper character development. We realize that it's sometimes easy to fall in this trap when you're OOCly announced of "daaaaaaanger coooooooooomiiiiiiiiiiiiing," but please try to follow the natural flow of your character's evolution. You don't always have to win. In fact, a small KICK IN THE SHIN, KNOCK ITS TEETH OUT, OH-EM-GEE IS IT STILL MOVING?! Is good for every character, now and then.