Just to be clear, if you don't include anything on the JSON parameters, they get their default values. In the GeneralDisplayJSON parameter, the default is:
// General Display
header: {
left: 'prev,next today',
center: 'title',
right: 'month,agendaWeek,agendaDay'
},
theme: false,
firstDay: 0,
isRTL: false,
weekends: false,
fixedWeekCount: false,
weekNumbers:false,
height: 'auto',
contentHeight:'auto',
aspectRatio:'1.35',
eventLimit:'True',