About Mishraji, with all due respect to the actor, I think it's probably a casting mistake. He just doesn't seem genuinely humble to me, no matter what his dialog is.
Yes agree, you can't just enter people's rooms without permission (though many parents don't really think so).
Someone mentioned in another thread that Michi's room is 'like a park' and that's amusing because even the parks (that I've visited) have 'opening hour' thus are closed for public at night 😆