I recall (vaguely) reading an article in the American Math Monthly in which the author studied a story in which Sherlock Holmes determines the direction of a bicycle by the tire tracks. Seems Doyle got the direction backwards because he got the math wrong.
Probably off topic:
In "The Professor and the Madman," which is about creating the Oxford English Dictionary, Simon Winchester uses the word "quayside," in the last chapter. "Quayside" looks as reasonable as "dockside," but there isn't any such word. Everything is backwards: dockside is beside the dock, where the water is, so "quayside" would mean in the water beside the quay. I think this was a little joke on Winchester's part so while it may be an anomaly it's not an error.
P.S. As Chantey vs. shanty has been beaten to death, I propose debating quay/key. How does "Quay West" strike you?