In the crossover of Legends, Flash, Arrow and Supergirl, near the end there is a conversation that bewildered me between Felicity and Ray.
Felicity looks at Supergirl and says something like "It's like looking in the mirror". And Ray answered something like "I think she looks like my cousin".
This seems to lampshade and make fun of the fact that Felicity and Supergirl are played by the same actor and also Ray and Superman (in Supergirl) are played by the same actor. But AFAIK this is not true. There are in both cases different actors.
So what does this conversation mean or refer to?