"Catalina, no. You're not good at plans. You were just lucky Elliot can be mellow about some things."
Personally, I look forward to writing more Catalina plans, and I'll find excuses to do so, darn it.
You have until Monday's comic to successfully guess why Sarah is thinking "wait a minute" before being flat out told! Or however long you can resist hitting the "next comic" button if you're from the future. As far as I know, no one has predicted the thought she just had, but I could be mistaken.
In any case, it is possible to successfully guess based on previous comics in this storyline.
Incidentally, it's tempting to rewrite the storyline so that Tedd's dad really did write that comment, but no, that wouldn't make any sense. Retroactive spoiler warning, I guess: Tedd's dad did not write that comment.