So back in the golden age of entertainment as far as radio, film, and television go, a lot of actors and personalities seemed to have really and noticably distinct and unique ways of speaking, in terms of both their voice, and their inflections. More often than not, it seemed like cartoon characters (and in some cases, even puppet characters) had voices that were basically straight-up impressions of these actors . . . how often have we seen cartoon characters that were mad scientists, or lab assistants, or just creepy little guys, who sounded like Peter Lorre? Or easily-flustered, somewhat absent-minded characters who sounded like Ed Wynn? Or wise-cracking boors who sounded like Groucho Marx? And, of course, like so many other aspects of cartoons and such, kids never even really picked up on these nods until they were adults and knew who these people were.
This really isn't something you hear a whole lot of in cartoons nowadays, with some minor exceptions . . . like, for instance, there was an episode of COW AND CHICKEN where their blues singing next door neighbor was believed to be voiced by B.B. King, but was actually Greg Eagles (Grim) doing a B.B. King impersonation; likewise, the Duck Brothers from COURAGE THE COWARDLY DOG were believed to be voiced by Ringo Starr, but were voiced by Will Ryan doing a Ringo Starr impersonation.