A shared universe of shows sometimes means that sometimes things get spoiled if they are watched in the wrong order. And sometimes, they spoil even if you do watch in the right order.
In The Flash season premiere “The Flash Reborn” which aired tonight on The CW, Cisco (Carlos Valdes) mentions some smart minds he reached out to for help on something — and two of those people were Felicity and Curtis, spoken of in present tense.
If they had died six months ago on “Lian Yu” in the Arrow season finale it is doubtful Cisco would be able to call them.
We’ll see for ourselves who survives in the Arrow season premiere October 12 on The CW.