What is different about Scrooge when he says 'remember it I could walk it with a blindfold'?

Oh, dude, when Scrooge says "remember it I could walk it with a blindfold," he's basically saying he knows the place like the back of his hand. It's like when you've watched your favorite movie a million times and can recite every line without even thinking. Scrooge is just flexing his memory skills, like, no big deal.