re: #112 austin_blue

“…By including a trivial piece of false information in a larger work, it is easier to demonstrate subsequent plagiarism if the fictitious entry is copied along with other material. An admission of this motive appears in the preface to Chambers’ 1964 mathematical tables: “those [errors] that are known to exist form an uncomfortable trap for any would-be plagiarist”.[7] Similarly, trap streets may be included in a map, or invented phone numbers in a telephone directory.
en.wikipedia.org