A Zone 1 interchange which might have been useful to show is Cannon Street to Bank (W&C) (using the new Walbrook entrance), which is much more convenient than trekking through to Monument.
The currently-popular Lancaster Gate/Paddington walk will be of less use when Crossrail connects Bond Street and Paddington directly.
New Cross/New Cross gate is a useful interchange between Overground services on the Forest Hill line and South Eastern services to Lewisham and beyond, but of course TfL like to pretend the latter don't exist.