No More Accent
If you watch the first three Die Hard films, you may not realize that Bruce Willis plays John McClane with a slight accent which I'd like to call "The Bruce Willis 1980s New York-ish Smartass Voice." You don't notice it because that's just what Bruce Willis used to sound like. Not anymore. Now Bruce Willis sounds quiet and mumbly, like he's constantly about to cry. People change, but John McClane is not supposed to sound so tired and boring.