But for all the pretty scenery and fun additions we see in the third installment something had to give and, in a weird choice, that was major plot points, specifically The Marauders. Not having just one line explaining that James, Sirius, Remus, and Peter are actually the Marauders really messes with how cool the plot of the third book is. And noooo Lupin saying Mischief Managed is just not enough. Also more Marauders stuff never hurt anyone, come on.