Undocumented Mex functions can be used to extract the state of Matlab warnings in run-time.
Password fields and spinner controls can easily be embedded in Matlab GUIs.
Sending emails and SMS (text) messages from Matlab is easy, once you know a few quirks.
The new implicit expansion feature of Matlab R2016b can break user code in unexpected ways.
Fetching SQL ResultSet data from JDBC into Matlab can be made significantly faster.
Matlab uses logical (scaled) pixel positions. With high-DPI displays, this might cause problems, but it is easy to retrieve
A file-selector dialog window that includes an integrated preview panel is shown and explained.
HTML can be used to add image icons to Matlab listbox and popup (drop-down) controls.
Matlab uicontrols can often be customized using plain HTML/CSS, without need for advanced Java.