The strange thing this time is that, since I've already completed this level (both in story mode and in freeplay mode), I was able to identify some missed opportunities where you could have very easily been able to collect a few other things (and yes, you really did miss an already accessible area where you could have gotten a couple things). Also, in that additional room you stumbled into earlier, what you're supposed to do with those red boxes is carry them to the perched owl, who will then fly away with it and you will then be able to purchase a special ability associated with that box.
For my progress in this game, I've already completed all 24 levels, both story mode and freeplay mode, so now all I have left to do is finish exploring Hogwarts to collect all the remaining items left to find. Due to my fears that I could potentially end up trapped in one of those rooms, I decided to watch some other videos of someone else going through everything so I could be prepared to hopefully reach 100% game completion. Trust me, even with the help of a guide, you really need to figure out where you can unlock characters with certain abilities, such as someone who can use dark magic.
Anyway, even though I'm sure you have no interest in going for 100% completion like me, I did find out in the other videos I watched that there are a few places in exploring Hogwarts where you'll end up seeing some cutscenes not part of the main story. First, in the lessons hallway (the room with doors into the many different classrooms), go into the room upstairs to the right (near the bubbling cauldron, but don't use it as you'll need all three of the standard characters in the room), where you will have to learn the transfiguration spell. All the other cutscenes will be in Hagrid's garden. First, you must help Ron when he ends up barfing up slugs. After that's done, return to Hagrid's garden, find, build, and use the time turner, and your next task will be to help Hagrid hatch a dragon egg. Of course, you don't really have to do any of this, but I thought I'd point them out in case you were interested.
Edited by Chronicler06, Mar 06 2018 - 07:22 PM.