Donna tells Kitty the meditation she and Midge are doing is called 'tai chi'. Tai chi is a form of karate. What Donna, Midge, and Kitty are doing is called 'tai chi chi'.
When Hyde gets the job at his father's company, you can see that the "wall" with the light switch is not really a wall.
Before the statue falls on Schatzi, he is barking but his mouth isn't moving.
Hyde says the numbers in Skokie don't add up. That's not his job.