iphone4 testing with an iphone4 and the simulator using iphone4, blackberry z10, blackberry q10 and nexus4.

General Observations
It would be good to place a back button on the pages that display source code, or leave the header with the back button intact.

Non valid characters (such as squares instead of hash tags) are displayed in the code snippets in the description tabs.
Blackberry theme sometimes renders the background improperly in simulator. Blocks of color are missing.
Date Spinner application is named Date and Time in the index.

Demos

In List app, Cursor changes to link pointer over non href text.

Device Themes
Blackberry 10 Theme displays footer halfway down the screen.

Confirmation Panel, Panel Popup
In jquery Mobile Theme the dialog Panel is transparent so text gets rendered over text.

Tabset
In blackberry 10 theme the text is too large for the "Orientation" button in the settings tab

Geolocation
The map is too large for the screen causing horizontal scrolling in the demo. On an actual iphone the map is sized properly. When navigating away from Geolocation there is a console error:
Uncaught TypeError: Cannot read property 'clientHeight' of null


GoogleMap
In simulator when loading Google Map the navigation index for all demos is forced into the left side of the screen. On a real iphone the demo loads properly but continues to load the map when you try to swipe the screen back up to where the controls are. The map gets larger and takes over the application.
Uncaught ReferenceError: google is not defined