The airplane in which Stream takes Lilly to upstate NY is a 1931 Bellanca CH400 "Skyrocket," registration NC12635. It was owned by Wallace Beery. Only 32 planes of this variant were made. Subsequently sold to a mining concern in Saudi Arabia, it was destroyed in 1937.
In John Divola's book 'Continuity' (Smart Art Press & Ram Publications, 1997), he lists photograph #1 in the 'Evidence of Aggression' section as 'Unidentified.' It is a still from this film; it depicts the table in Lilly's room that Lou falls onto and breaks when Alex Stream pushes him.
Originally set to be produced by RKO in 1930.
Alex orders a Lady Alexander cake for his wedding anniversary dinner. A Lady Baltimore cake is an American white layer cake with fluffy, usually boiled frosting with a fruit and nut filling. The cake is believed to have been created in the Southern United States in the early 20th century, but its exact origins are disputed.
Upperworld (1934) is one of the last films released before the strict enforcement of the Hollywood Production Code by Joseph Breen, which began on July 1, 1934.