Angela Lansbury doesn't play Jessica in this episode but reprises the role of Emma MacGill from the episode Sing a Song of Murder.
Inspector Frost asks that the trunk of the car be opened. In the United Kingdom, a trunk is never called such. It is a boot.
In this episode, Angela Landsbury sings 'Spoon With Me' which she also sang as a young girl in the film 'til the clouds roll by' a musical about the life of Jerome kern.
Angela Lansbury: "Goodbye, Little Yellow Bird" (song)
In the film version of Oscar Wilde's classic "The Picture of Dorian Gray," Angela Lansbury-- playing the part of the doomed Sybil Vane-- sings a period piece entitled "Goodbye, Little Yellow Bird." In this episode of "Murder She Wrote," Ms. Lansbury reprises the song while playing the part of her character's cousin, Emma McGill.