[SunTzuWu]

The final and most obvious clue was 22:59:44...which was when Saul revealed Ellen.

I missed something. What was significant about 22:59:44?

[Lucius Cornelius Sulla]

That is the exact EST time in the episode when Tigh showed it was Ellen. Dirty trick!

[NELSON111]

It was the final clue on You Will Know The Truth

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Another clue about Ellen was Lee saying "We believe the 5th Cylon is dead." at a press conference.