RDA is unbelievably endearing as O'Neil. That's one L by the way. :-)

There's apparently an in-joke about that. In one of the episodes, they made a mention of a Colonel O'Neill (with two Ls) that didn't have much of a sense of humor. Obviously a reference to Kurt Russell's interpretation of the character. Leading some fans to conclude that RDA's O'Neil and Russell's O'Neill are two separate characters.