Sasha's "gypsy" sequence was a) not the right choreo for that part in that song/music (she was doing "russian folk dance steps" instead of "gypsy dance steps", and too few "ethnic steps" all together for "Dark Eyes" over-all),
This might have made a difference to ice dance judges judging an OSP/OD/short dance/rhythm dance. But authenticity of on-ice steps to off-ice dance sources has never been relevant to freeskating, either in the written rules nor, apparently, to singles/pairs judges.
It has been in ice dance.
at 2005 Worlds, where there were clean programs from the ladies in 2nd through 9th, but somehow Irina was in 1st after a botched combo and a spin mistake. It might not have mattered in the long run, as she won the LP by a large amount, in spite of doing too many triple loops - although even there, I think she got the benefit of the doubt, this time from the tech panel, as she should have had her whole triple loop-double loop jumping pass invalidated under the rules at the time, but it appears from the protocols that she still got credit for the double loop.
My recollection is that as of 2005 Worlds the rules were ambiguous about how to handle a combination jump with one of the jumps being a Zayak violation. The following season the rules were rewritten to invalidate the whole combination -- in reaction to that specific example.
(And then just a few years ago the rule was rewritten explicitly to invalidate only the repeated jump.)
(3) According to my memory, URs were already explicitly penalized as early as 2005-06. I remember clearly Shizuka getting shafted out of GP Final by underrotating the flip in the short program at both of her GP events. I also remember Alissa Czisny landing a cheated 3lutz-3toe and only getting credit for a 3-2.
For the first year or two of IJS, underrotated jumps were "downgraded" to the value of the jump with the same takeoff and one fewer revolutions, and the protocols reflected the code for the lower-revolution jump.
That proved to be a problem with keeping track of repeated triple attempts for purposes of the Zayak rule, so the < symbol was introduced as a modifier to the code for the higher revolution jump, to indicate that the revolutions had been attempted, but not achieved. IIRC that symbol was introduced in the 2006 season.
The < downgrade to the value of one fewer revolutions for jumps over 90 degrees short of rotation remained in effect through 2010.
Then the distinction between < and << was introduced starting in 2011 season, with jumps 91 (now 90) to 180 degrees short receiving a lower base value of 70% of the rotated jump, and jumps over 180 degrees still earning the value of one fewer revolutions.
But it is not a cherished tradition when attending most theatrical productions, where there are actual performers present.
Eating snacks during sporting events and performances such as circuses held in big arenas/stadiums is certainly a tradition. For skating performances held in that kind of venue, I'd expect most audience members would default to standards appropriate for those kinds of events and not to behavior expected in an opera house or legitimate theatre.