Wow. That's actually a lot more interesting than I was expecting. You want my opinion? Dude should've never poked his nose in someone else's business to begin with. Also, how do you accidentally acquire someone else's keys?
Unless the manga somehow plays music, I really don't think it would have as big an impact as the anime. s**t, hearing Ritsuko sing Favorite Things was possibly my favorite moment in the anime. I mean, every number in this song was worth listening to. I couldn't help but smile every time they played; in the basement, in the auditorium, in the church, didn't matter.
As for my opinion on the last few moments, I felt like I was left hanging. I think more than anything I wanted some closure. Did they stay together forever and ever after that? Or did they hang out for a bit, get a cup of joe, call it a day and then leave again?! I NEED TO KNOW! gonk