Well, technically that inconsistency isn't in season one, though.I just stumbled upon an unexpected character inconsistency in S1.

But I know what you mean. They pretty much made him a different character later on and tried to mask it as character development. Personally it didn't bother me too much, though.
... and tried to kill Quark!Rom was a completely different character from season one to season 4 or 5. He even talked different.
