Yeah, quite a bit must have changed or more likely evolved through the years, so a lot of the pseudocode and algorithms have been modified or added for instance, topics on dynamic programming, memoization and the like have had more emphasis. Several revisions to examples in basic tree algorithms and additions of some too have arisen. You could consider brushing up on a few things as a casual read perhaps, especially on the new topics. Also, another book I found great was Skiena's Algorithm Design manual.

[1] https://www.quora.com/What-is-the-difference-between-CLRS-se...