The most annoying example of badly spelt content is an entry in the book for one of the contributors. The reason it’s annoying is that he himself noted the error when reading the first proof, I corrected the entry on the website, see supplied by, added a few additional contributors names in a subsequent draft, requested two more proofs, but still failed to notice the problem until I ordered the special batch.
Interestingly I’ve always had a problem with the number of l’s in words. But usually I use too many, not too few.
Sampled from Supersticious Beliefs.