Normally, the skaters have time on the rink to rehearse, so they can make adjustments. But I know that the rehearsal time isn't always under the exact same conditions - for example, the lights were low/the skaters were under a spotlight during the performance, and that can mess with you even if you've rehearsed in the same lighting, which they may not have done. I heard that some other skaters did have issues with the rink size during the performance, but others can confirm.
Evgeni's issue with the jump itself didn't appear to be due to the seats on the floor area, although of course I can't be sure of that. The issue he had with falling into the audience happened after he hit his head (twice?) and was disoriented.