Mr. Wednesday's Missouri license plate starts with the number 3. In Missouri, only trucks have license plates that start with a number. His 1966 Cadillac Fleetwood Brougham would start with a letter, or better yet would be eligible for Missouri historic vehicle plates.
Every character has butchered Zorya Vechernyaya's name, whilst trying to pronounce it; Even Czernobog always mispronounced it, despite the fact that he shares his ethnicity with her and should not have troubles with Slavic pronunciations.