I don't see what's the big issue here?
Variety - if someone is doing the same thing over and over again or not
Originality - if someone is doing the same stuff that 95% of other freestylers are doing or not
For the "how hard" part, we have the Technical category, which is just about the difficulty of the moves.
All of the judging categories apply allround/to all trick types.
About the timelines, you have two options:
a) Leave your video as it is and have it judged only until the 1:20 mark
b) Make a new one with the appropriate timeline
