Paul and Rachel know about Cal and that Cal's probably Kira's father. We saw that in one of the previous episodes (I binge watched a bunch, so not sure which one) This may mean that Marian and general Dyad knows as well. That's one of my main problems with Sarah--she assumes she knows who knows what even though she should know that she doesn't. Daniel and Art both tracked her to Cal's, so she should know she has no clue who all may know about him. She may think she's protecting Cal by keeping the truth from him, but she's wrong. She's just leaving him at greater risk by giving him incomplete information.
However, I did think the "you're a... Pisces" was a subtle exchange letting us know that Cal does suspect the truth, but was saving Sarah from having to talk about it. Why he's so nice to her, however, I'll never know.
On a different subject, I hate Allison so much at this point that it's starting to take me out of the show. I get that her scenes are supposed to be black comedy to lighten things up from Cosima/Helena/Sarah emotionally heavy scenes, but it just doesn't work for me. The way she complained about Aynsley seeming to think of herself as better than Allison and her chirpy "I do feel better" after admitting to letting Aynsley die while Aynsley clawed at the counter and begged for her life came across as sociopathic to me. I had thought the show was going for a storyline of Allison repressing her guilt that was eventually going to culminate in character growth, but now I'm just not sure.
At this point, I want all the bad things for Allison. She is a hideous, self-centered person, who does not deserve Donnie, custody of her kids, or support from Clone Club. I do still hope character growth actually happens, and she admits that she's caused almost all of her own problems by leaping to conclusions and making rash, life changing choices based on them. I also want her to admit that Aynsley was a good person and a good friend, whose only "crime" was daring to see that Allison was falling apart and trying to help as best she could. I want Allison to recognize that she's responsible for kids losing their mother and people losing a friend. I also want her to admit that she kept significant, important secrets from Donnie and that she is as, or more, responsible for the problems in her marriage. I need her to make some kind of sacrifice to atone for what she's done and the problems she's caused.
Also, just once, I want Sarah and Felix to stop enabling Allison's paranoia. I wish they had pointed out that she had no idea whether Dyad's ever even probed her, much less whether Donnie was involved with it. For all we and Allison know, what happened with Sarah was a unique occurrence because Dyad was wondering whether she was a clone impostor rather than being Beth.