The worst revision of datasheet I have ever seen (read got caught by) was on supply voltage. In the older datasheet I originally had (at work we use common components and store datasheets on a local server) happily said the chip worked down to 3V - Goody, I was designing with 3.3V. The new datasheet changed this to 3.7V. Fortunatly, I spotted this before I had the PCB laid out.