There’s no Marvin Gardens in Atlantic City. Most properties in Monopoly correspond to real locations in that town, but Charles Darrow accidentally misspelled Marven Gardens, a local housing area, when he created his homemade prototype of the game in 1935. The error persisted until 1995, when Parker Brothers formally apologized to the residents of Marven Gardens for the misspelling.

In 1974, San Francisco State University professor Ralph Anspach released a variant of the game called Anti-Monopoly, in which the board is “monopolized” at the start and players compete to return to a free market system. Parker Brothers tried to suppress Anspach’s game, essentially claiming a monopoly on the word monopoly. Apparently that was too much irony for the Supreme Court, which ruled in Anspach’s favor in 1983.