What changes between C++98 and C++11 show difference in behavior?

I was reading the following post:

• What changes introduced in C++14 can potentially break a program written in C++11?

and also the isocpp page:

• http://ift.tt/2orW9QD

So I became curious, according to the Standard: What changes introduced in C++11 can potentially break a program written in C++98?