One of the most annoying tropes for me is when the villain steals something from the protagonist/has information the protagonist needs. The villain tells the protagonist that he will give him what he wants if he goes on a quest and retrieves an item for him, or something like that. The protagonist does so. Then comes the part that annoys me. A smart protagonist would think to himself “I better make sure the villain fulfils his side of the deal before I fulfil mine, because he can’t be trusted.” So basically, when the protagonist arrives with the item he retrieved, the first thing he says to the villain should be: “Hey, here’s that thing you wanted. But you have to give me what you promised first before I hand it to you.” Instead, the protagonist just flat-out unquestioningly hands it over, and, utterly predictably, the villain reveals that he was lying and never intended to keep his promise.
Most additional scenes in the novelizations were actually in whatever script was referenced.