Even though Young Edward lands in Korea, the ventriloquist and his puppet speak in Tagalog (language of the Philippines) while the Siamese twins and Edward speak in Cantonese (a Chinese dialect). The soldiers who pull the ventriloquist off the stage speak Mandarin Chinese (language of mainland China and Taiwan) while the other soldiers speak in Korean.
The scenes at Auburn were originally supposed to be shot on location on the campus of Auburn University in Auburn, Alabama, but the school officials asked for script approval and the production didn't have time to wait so they filmed the scenes at Huntingdon College in Montgomery, Alabama instead.
Young Edward becomes a traveling salesman for a company that sells hands with metal tools as fingers, all held together by a plastic base. The crew were aware that people would draw connections between it and Edward Scissorhands (1990), and therefore purposely did not include scissors in the design.
The actor who plays the banjo in Spectre, Billy Redden, is playing the iconic song Dueling Banjos from the film Deliverance (1972) when Edward Bloom arrives for the first time. Redden played Lonnie in Deliverance.
Joseph Campbell's book, "The Hero With A Thousand Faces" appears in this film. It is shown first on a sleeping Edward Bloom (before being picked up and placed on the nightstand by Josephine) and then later it's still on the nightstand during a scene between Ed and Will. Daniel Wallace is an outspoken fan of Campbell's.
The two portraits on the walls in the bank scene are actually of the founders of Bishop-Parker Furniture Co., Montgomery, Alabama. Several props were purchased there. The buyer noticed the portraits and thought they would pass as old bankers.
The trivia item below may give away important plot points.
In the middle of the lettered board in the bank that Norther Winslow robs reads "ROMANS 12:1-2." This refers to the passages in the Bible that says, "Therefore, I urge you, brothers, in view of God's mercy, to offer your bodies as living sacrifices, holy and pleasing to God, this is your spiritual act of worship. Do not conform any longer to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God's will is - his good, pleasing and perfect will."