Character mistake: When you stretch and wake up after hooking up with Aubrey, your character says it's time for "AN new day."
Bug: When Josh asks you by phone to meet Amber and her other rather available friend, the screen is not locked, so you can change screen and avoid replying him entirely, but the game treats it as if you did and you are meeting him anyway. The option to reply through the phone is still there anytime days later, obviously to no effect. Normally the game forces you to reply before you can move forward.
Revealing mistake: When the protagonist is in the school library, the shelves have always the same few textbooks with easily readable titles spammed all over the place. Using generic nameless books would have avoided the problem easily, this way it is obvious to the point of being distracting.
Factual error: One of the first transitions between scenes during college life is styled as a book cover the protagonists is reading. Too bad that they wrote it on the wrong page - he's not reading a manga.