The Applied Statistical Essentials webcast from Predictum covered leverage plots.See if the two leverage plot episodes give you what you need.
The link by @Jeff_Perkinson below is not working. I appreciate it if the link to the webcast can be corrected.
Unfortunately it doesn’t seem to be available any more. Perhaps @wjlevin can find an archive.
I came across a recent request and uploaded the original videos to Vimeo.
Just a note the video links are reversed. The top link is Leverage Plots 1