When you battle the first boss in the Japanese version, you can clearly see a symbol on the top of the boss's forehead which someone can assume it looks eribly familiar to a swastika, but's it not. The symbol on his head is a manji, which is a Buddhist symbol for balance which could mean love, mercy, strength, and intelligence. The symbol was removed in the International version and the boss's forehead was made more rounder due to this.
Originally when Kid Dracula is flying in the intro sequence, he will pass a part of a church with a cross on the very top of it and a bell ringing. The tower was altered in the International version to not give any resemblances to religion. Despite this change, you can still hear the bell ringing even though it was removed.