Early in the movie, Pi says that Hinduism has 33 million Gods and Goddesses. In Indian English, the word 'crore', which means 10 million, is used rather than million. A fundamental belief in Hinduism is that there are 33 crore Gods and Goddesses. This converts to 330 million, not 33 million. (The use of million rather than crore may be a translation for the benefit of the audience, rather than a goof.)
When standing in French class talking about his name, Pi writes the number pi to nine digits after the decimal point. According to mathematical rounding rules the ninth digit should be 4, not 3 (pi = 3.14159 26535 89793 ... ).
To demonstrate animal behavior, Pi's father lets a live goat to be fed to Richard Parker. His worker comes in and ties a goat with a rope to the iron bar of the cage. Goat is outside the cage facing Pi and the family. Then the worker opens the second door so the tiger could come through.
The thing that would happen if the tiger comes in and attack the goat who's outside the cage is, the goat will jump backwards to the maximum the rope will allow and the tiger's head will get smashed against the iron bars of the cage injuring him.
Correct way is to tie the goat inside of the cage and then let the tiger in through the second door and watch what happens.