In reading your question, I gather this was just background content rather than something actually referred to in dialog, or held in close shot. In that case, you’re probably okay.
“Is it good for the company?” could be on any whiteboard in any office on the planet, so even though that phrase might be copyrighted in the script of Office Space (as dialog), it’d be really really hard to make a case for intentional infringement.
The TPS report cover reference is a bit more direct, but again, in the absence of an admission of guilt, the anagram “TPS” could apply equally to what your fictional company was preparing reports on. Anagrams cannot be copyrighted.
One has, under copyright law, the “Fair Use” defense, and one of the Fair Uses is parody. I have spoofed many copyrighted productions(although I won’t go near a Disney property) for purposes of parody or satire. Generally if one is not being defamatory or claiming endorsement from the copyright holder, such use is excused under Fair Use. Be clear, however, that Fair Use is a defense against a lawsuit claiming infringement (which may or may not be accepted by a court) and not a privelege under the law.
The ultimate question here is whether or not what you have going on in the scene is more interesting than what was written on the board. Unless you have somehow draw specific attention to it, many viewers will not even notice the “inside joke”, and those who do will not likely go marching down to the production company for Office Space and turn you into their attorneys.
If you are really that concerned about it, just add a bit of blur to the board to make it less readable, or replace it with something else. Odds are it’s not an issue to even think about paying legal fees over, but the easiest and cheapest way to avoid any trouble is just to erase it.
Larry S. Evans II
Executive Producer
Digital I Productions