When solving the love story between Ted and Zoey, Marshal used Clue characters. Ted wore only purple throughout the episode as Professor Plum, Zoey wore only white as Mrs. White, Barney only wore green as Mr. Green, and Honey only wore red as Miss. Scarlet. The Captain was just Colonel Mustard.
At the beginning of the episode, when Robin has cooked dinner, it appears to be burnt. Robin says she thought the oven was Celsius, but Celsius readings are lower than Fahrenheit, so the food would have not been burnt.
Ted: (to Barney about Honey) I'd say "hump her brains out", but it looks like someone already has!
International Airdates: Australia: March 24, 2011 on Channel 7; United Kingdom: June 9, 2011 on E4; Germany: October 26, 2011 on ProSieben; Czech Republic: February 7, 2012 on Prima COOL