Question: When Jack plays Let It Be the second line refers to "Mother Mary." Wouldn't that seem odd to an Indian family?
Question: If there was no Beatles, where did the toy yellow submarine come from?
Answer: Believe it or not, the Beatles did not invent the idea that a submarine could be yellow, and yellow toy submarines were sold for children to play with.
Answer: It is just a toy submarine molded or repainted in yellow. Only the 'stalker' fans know the reference to the Beatles song.
Answer: I think it was so those 2 people that knew of the Beatles could prove they knew the Beatles song, since presumably that was a song Jack forgot about.
Answer: None of these answers explain why it's shaped the same as the submarine from "yellow submarine." It's a specific shape that didn't exist before the Beatles, so shouldn't exist.
Answer: Considering there are close to 20 million Catholics in India and Jack seems to be pretty assimilated into English culture (his name is Jack after all), it probably wouldn't seem that remarkable.