Retro 8-bit Mode
There is a hidden 8-bit retro mode in Broken Age that resembles early PC adventure games. Here's how to unlock it:
In the options menu, set the resolution to 640x480.
Activate "key remapping"
Look for a new button showing Shay and Vella in the lower right and click it
You can now use this button during gameplay to toggle between resolutions.
You can also map a key for the Shay/Vella button, allowing you to toggle between resolutions quickly. When you do this, you can actually change the game's resolution back to your your monitor's resolution and still toggle between a retro and modern look. It looks much better this way, since it's not stretched out.