There’s a flag that appears towards the end just to the left of the Van Gogh, which seems to be based on a Nazi flag, but green and with an iron cross instead of a swastika, and the 4chan logo instead of the iron cross. I think? I’m not quite sure what it is supposed to mean, but I guess somebody took offense because by the end it had been mostly converted to a rainbow flag.
Overall though, I am impressed by the paucity of hateful symbols given that there were no apparent controls against them aside from the collective action of the community.