Inconsistency/plot hole (spoilers, duh)
When the sprinklers went off, everyone knew they would, which means they could hide their own paper under a table, as Blonde did, and they would not spoil it. Anyone who knowingly got their paper wet, or let anyone else get their paper wet, spoiled it and is disqualified.
In other words, after the sprinklers at least 2 people would be disqualified. Assuming they used their own paper, Black and Brown (if i remember correctly) would be disqualified.