I like the way the bird says "hey, here's the mail" in "hi, im steve". Like there's just the slightest pause before he says "mail", like not steve had already asked him for so he was going to say "hey, here's this" or just "hey, here's the..." and just expected not steve to thank him before he finished his sentence, but then he didn't so he just had to retrieve the word "mail" from his memory since he hadn't expected to say it. I dunno if this is what you were going for but it's totally relatable for some reason, even if it's just a small thing like that.
that is absolutely intentional, it seems to be a clear contrast from before, when the mail was delivered with huge confident fanfare