Enabling user callbacks during zoom/pan
Matlab zoom, pan and rotate3d modes hijack the user's figure callbacks, but this can be overridden.
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Pinning annotations to graphs
Annotation object can be programmatically set at, and pinned-to, plot axes data points.
Multi-column (grid) legend
This article explains how to use undocumented axes listeners for implementing multi-column plot legends
Accessing plot brushed data
Plot data brushing can be accessed programmatically using very simple pure-Matlab code
Legend '-DynamicLegend' semi-documented feature
The built-in Matlab legend function has a very useful semi-documented feature for automatic dynamic update, which is explained here.