The writer who scripted the episode, Andy Reaser, cryptically tweeted about it, saying, "Is it just me or did Spencer solve that code awfully fast... #pll."
Before we saw that tweet, we chalked Spencer's (Troian Bellisario) quick thinking up to her intelligence and the fact that watching the Liars puzzle out each letter would be boring. However, now we're not so sure.
We trust Spence, and we don't know why she would lie about not knowing the code if she did — unless she's secretly involved with the "A" team or Mona. Could that be possible? Or is Andy just joking around and messing with fans' minds? The PLL writers do like to toy with us...
What do you think: Did Spencer's quick thinking ping alarm bells for you, or is she just very smart and good with words?
Catch an all-newepisode of PLL on Tuesday, July 31 at 8 p.m. ET/PT onABC Family.