John claims the Big Bang Burger is charging $0.25 extra per burger for the Secret Sauce. In 1955, adjusting for inflation, that's an extra $2.47/burger just for sauce.
In the official press release for the episode, Adam Tsekhman's name was misspelled as "Adam Tsekham".
At 21:00 -Amelia Earhart would never have referred to the port side engine as the left engine.