The pinky toe being an "evolutionary speed-bump" is mentioned in this episode. This was last mentioned by Teller at the start of season 1.
Jake: (closing narration) There are infinite ways to communicate; some better than others. Signals, signs, patterns, mathematical in design, all around us. You just have to know how to see them. How we read these subtle cues determines the course of our lives. Language is considered the ultimate form of communication, designed to optimize our connection to each other. Today, the average person will say 2,520 words to 7.4 other individuals. Yet change the language, one border to the next, and we are hopeless. Stumbling to explain the simplest of concepts: I want, I am, I love. My name is Jake. I was born on October 26, 2000. I've been alive for 11 years, 9 months and 12 days. And in all that time, I've only said a few words. But I'm getting the hang of it now. And there's a lot more I have to say.
Original International Airdates:
Canada: May 10, 2013 on Global
Norway: July 17, 2013 on TV2
Finland: January 21, 2014 on MTV3