In Double Date (2013), Jess tells Nick that she is "weirdly good at volleyball"; but when playing volleyball with Coach in this episode, Jess doesn't manage to hit one ball correctly and even seems to be afraid of the ball.
Principal Foster tells Jess he is "exclusively into Asian women" - a feature of his personality retained in other episodes - but in Winston's Birthday (2013) Peg, a white woman and teacher at Coolidge who finds Jess the job, tells Jess that Principal Foster is "porking" her.
Principal Foster spoke of Kristi Yamaguchi having been at "Lillehammer." Yamaguchi won gold in Albertville (1992), and was not an Olympian in Lillehammer (1994).