I did a college production of Flora, The Red Menace a few years ago, and I kept getting very annoyed that some of the theatre faculty (who should know better) kept saying Flora AND The Red Menace.
I also remember a director who was (positively) raving over Miss Saigon when it first came out, and kept referring to this big song he loved called "Solo Saxophone." Naturally, it took me forever to find that song on the recording. (Or should I say soundtrack?)
Though perhaps my favorite gaffe is seeing a resume listing of City Of Angles :-)