TIL that the original "revolver" in Clue was... a Colt M1911 semiautomatic PISTOL, which, you may note, is not a revolver.
They finally fixed it 13 years later by replacing the pistol with a revolver, though, for unknown reasons, they chose an Allan and Thurber Pepperbox model, which has a distinctive look but was obsolete by the Civil War.
Now if only they'd fix the "candlestick" terminology. It's a candleholder! You couldn't murder someone with a candlestick!