When Scott and Robin are being chased in the hearse, a leather cap appears on Scotts head in one shot, and quickly disappears again.
After the dancing girl is knifed in the back, he positions her in front of the Victrola revealing that she is a dummy.
In the first scene, set around 1930, the table is set with Roger's Flair pattern of silverware, which however wasn't made until the 1950s.