"When the last scene in Three Live Ghosts was shot, the three title characters were snapped with the director. Left to right: Claud Allister, Thornton Freeland, who directed this all talking comedy-drama for United Artists, Charles McNaughton and Robert Montgomery."
And who said Bob always wore tuxedos in his early movies. Really. (Although, the movie does end with him wearing a tux.)
Just look at young Mr. Montgomery. All that hair. And that hanky came in handy to cover up his long neck. Personally, I don't spend much time looking at Bob's neck.