Note that the second-edition rules completely changed the way powers were bought. This is a rules change, not an erratum, and affected most of the book, so you won't find it on this sheet.
P. 32. The total of enhancements and limitations cannot reduce the cost of a power to less than 25% of its original cost.
P. 40. Add under Flight: "Anyone capable of self-propelled flight (not Winged Flight) can 'fly' at half speed underwater."
P. 120. Darkshell does 8d damage with his fireball. His skill is 16, with a power of 8.