Okay: this post is about something I noticed while reading Detective Comics No. 90 the other day, but I can't just up and tell you what that thing was. I have to lay out a sequence of events for you - trust me, it's the only logical way.
The plot revolves around the riverboat Mississippi Mermaid and its 'celebrated water carnival'. Seems every time the durned thing comes to town, thugs clean out the whole place. Thugs that all buy their suits at the same place, I might add.
When the sheriff (note the purple vest and hat, the bushy white mustache) comes to check out the suspicious boat-people, he is foiled by their air-tight, witness-laden alibis. Since I'm not really paying attention to the mystery aspect of this story I'll tell you now that the whole scheme's dependent on a clock that speeds up and slows down to make the show's intermission seem shorter than it actually is or something like that - evidently this clock is so awesome to tell time with that none of the party-goers bother to look at their watches during the whole production.
Reading of the robbery in Carver Town, Dick and Bruce head for the next stop on the river...
Dalestown! Noted for its opulent hotel lobbies and abundant supply of nogoodniks in matching suits.
Batman gets trounced, wakes up, rounds up the sheriff, and heads boat-ward.
Wha? May I say, Mister Sheriff, that I have seen your like before? Well, I suppose that perhaps Dalestown and Carver Town are small and close enough to share asingle, purple-clad law-enforcement gent, right? Sure, it's totally possible.
Anyway, the Dynamic Duo keep on following the ship, and one week later (so: one week's travel down what is presumably the Mississippi River), in the scenic town of Andre's Bend (snicker), the bandits strike again. Once more, the law gets involved:
The purple-vested, white-mustached, Colonel Sanders tie-wearing law, who seems not to know Batman from Adam.
So: Possibly two but probably three identical sheriffs in three river towns along the Mississippi. My theory is that the American South contains a nomadic clan of law-enforcement types. As they walk the land they provide sheriffs and other forms of lawmen to towns in need of regulation - these three happened to be long lost triplets from that very tribe. That or the artist liked drawing sheriffs like this - this guy actually shows up all over the place in Detective Comics of the time.