Notebook 2
typo IdentationError instead of IndentationError
exercise 2.5: there's still a note (which you might know already, but anyway)
example 6:
it might be nice to mention that this is generally regarded as bad practice. If you have to use globals there is generally a better and less confusing way to set up your code. It can come in handy in certain specific use cases, but normally code is more readable when this is avoided.