As for fonts etc: https://hobancards.com/blogs/thoughts-and-curiosities/americ...
This could be explained away by them working for the same place and assuming to contact them you call the same switchboard and ask for the person, but even back in the 90s it would have been strange for wall street "Vice Presidents" (even if it was somewhat of a ceremonial title) to not have their own unique business number.
Also, Paul Allen giving his card to someone else with the same contact number for the purposes of being in touch to plan to play squash doesn't make much sense unless you get meta and assume Paul Allen was aware this had no practical value and just wanted to ego-drop the card.
Remember that _American Psycho_ is repeatedly hinting to you throughout the movie that most, or even all, of what you see is just Bateman's own delusions and hallucinations, which are inferior imitations of reality due to his own impoverished mind and lack of substance. So there's a lot of little tricks all throughout it to subtly destabilize you: https://www.moviemaker.com/american-psycho-anniversary-oral-...
