 CHAR: When Phyllis Diller walks into the witness room looking for  Denny Crane, she says that the met briefly during World War II.  Denny later says to Alan that they were "frisky in a foxhole".  Dennys age has been established to be 72 as of Season 2, so Denny  would have been at most 11 years when this friskiness was to have  happened while Phyllis Diller, who was born in 1917, would have been  in her late 20s. It could, however, have been a deliberate mistake  made by the writers for some reason.