There is a disco ball in each of the dioramas revealed thus far, and its vertical position is different each time. Given the fact that a famous New Year's Eve tradition is the lowering of an illuminated sphere during the countdown to midnight, it may be the case that this position is of some importance.
At this time, it is unknown whether this is a solid lead, so this theory is classified as neutral.
Ordering of the DaysEdit
It may be the case that once all the dioramas are revealed, putting them in sequential order from highest to lowest may reveal something about another part of the puzzle. At present, the vertical positions of the disco ball would yield the following order: