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I don't think that boring books can be made better by injecting errors into them. There are probably better ways to achieve 'deeper reading and understanding' - see 'the Little Lisper' for example.

If it's boring, it's not what you're meant to be doing. Read up on a subject you actually enjoy.

Whether something is boring often depends on whether you need it in your present task.

This means that you are more likely to skim material that does not seem highly relevant.

But that's not a good scenario for expanding your horizons.

You're right. This is a great idea.

It depends on which market you are trying to attract: Deliberate errors would only encourage readers who aren't already motivated to find errors. More advanced readers would already be on the lookout for "errors" in case the author has made them inadvertently, or in case the reader can extend the state of the art known & described by the author.