Problem: Theme's JS Conflicts with FullCalendar

I intend to use the FullCalendar module to display my events. The module uses the FullCalendar JSQuery plugin from Adam Shaw. The module and plugin remove all of the complexity of Calendar, giving a great-looking and easy to setup calendaring system. The problem is the JS conflicts with the JS used in the theme, because I can view the calendar correctly in Views and with another theme.

Any hint what JS might be causing the problem? (Here is the thread discussing the problem.)