How we cite our quotes: All quotations are from Home Alone.
Quote #4
HARRY: We'll get through the back. Maybe the kid will let us in, you never know.
MARV: Yeah, he's a kid. Kids are stupid.
The irony here is pretty obvious: Harry and Marv are totally underestimating Kevin based on his appearance. He's actually a lot smarter than they are.
Quote #5
MARLEY: You live down the street from me, right? You know, anytime you see me you can say hello; you don't have to be afraid. A lot of stuff has been said about me, none of it's true.
Marley's aware of the ridiculous rumors the kids have been concocting about him. After a few seconds of talking with him, Kevin realizes how kindly Marley actually is.