The clown painting from the first episode (the one that got covered with oil) appears between the two pictures for a split second.
The word "time" is said or sang 28 times.
When the duck tries to explain time in a philosophical sense, the board next to him has the equation "E=MC^2" written on it, with the E being replaced by the Nazi symbol. E=MC^2 is the physics equation attributed to Albert Einstein, who had a home in Germany when Hitler ordered the Nazis to begin the Holocaust.
It was a mystery on what the trio's favorite show was, until episode 2 of the TV series. That show being Grolton And Hovris.
Joseph Pelling was going to be the producer as well as the director until it was decided not to have a producer at all.