Removing user preferences from deployed apps
An unsupported MathWorks Technical Solution explains how to remove private information from deployed (compiled) matlab applications.
Documentation
xlsread functionality change in R2012a
The functionality of the xlsread function has changed without documentation or warning in the R2012a release.
Changes in the online doc URLs
Matlab release R2012b has broken a vast number of links to its online documentation pages.
Docs of old Matlab releases
MathWorks recently posted archived documentation for many previous Matlab releases