Although the film was originally shown with a mono soundtrack, and although the soundtrack on the DVD is mono, the three soundtrack albums made from this film (one with score and dialogue excerpts, one with the entire film soundtrack, and one with only the music) were all released in stereo.
When Romeo and Benvolio arrive at the Capulet's ball, Benvolios's love interest is seen standing in one place. In the next shot she's seen walking around and in the next shot she is seen standing in the same place she was before she began walking around.
Narrator: Two households, both alike in dignity / In fair Verona, where we lay our scene / From ancient grudge break to new mutiny / Where civil blood makes civil hands unclean. From forth the fatal loins of these two foes / A pair of star-cross'd lovers take their life / Whose misadventured piteous overthrows / Do with their death bury their parents' strife.