Interactive maps become less useful as the image displayed gets smaller. When they get below a certain size, it would be better to just freeze and provide a static image.
One cause of this is the buttons. When the map is too small, they will cover up too much.
An additional button that could be very useful in the context of WP articles: A 'reset' button that lets the user return to the initially presented map and undo any panning/zooming they may have done.
I will probably make a number of other small posts as I think of them.