In which Mel Brooks film does a director say "Will the dancing Hitlers please wait in the wings? We are only seeing singing Hitlers"?

Which casino with a double name opened in Las Vegas in 1968 as one of the first to cater to families? Which figure skater won the only U.S. gold medal at the 1968 Winter Olympics in Grenoble? Which country's epic film "War and Peace" won the Oscar for Best Foreign Language Film for 1968? Who joked "Welcome to the Academy Awards, or as it's known at my house, Passover"? Who won the 1968 U.S. presidential election? The 1968 Nobel Prize in medicine was awarded for the interpretation of which code and its function in protein synthesis? The 1968 album "Switched-On Bach" popularized which Moog instrument? Which 1969 Paul Mazursky comedy about two couples has four names in its title?