This entire movie is like a Warner Brothers cartoon...
...not just the "candy-gram" part (also a couple others) with Mongo.
Especially towards the end. For example, when Harvey Korman goes into the theater to see what happens. There's a Bugs/Elmer cartoon that does a similar thing. And earlier he gets into a cab with his face covered with shaving cream but emerges later with a clean face. Exactly what would happen in a cartoon.