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.