Life of Pi is an amazing story with extraordinary detail, almost enough to make you believe the story is true. In fact, if I did not know that it was fiction, I would be tempted to believe it all. The movie does not compare well to the book and I would advise not to watch the movie shortly after reading the book. I made this mistake and could not convince myself to enjoy the movie. The movie takes on a more lighthearted approach and fails to delve into the more serious aspects. It also messed up one of my favorite parts. The book, however, it fantastic and you should read it.
Spoilers now:
This part is mostly me ranting about how the movie was not as good as the book.
I originally saw the movie before I read the book, but it had been a long time. I remembered that there was a romance and, of course, a tiger, that the hyena had killed the orangutan, a zebra had died, the tiger had popped out suddenly, there was a scene with a mirror-like ocean, a glowing whale, and an island with a tooth on it. The romance did not exist at all in the book and I honestly don't think it was necessary in the movie. I understand that they were using it as a way to pull in the audience and tie up the strings at the end with the whole "I wish I had gotten the chance to say good-bye" thing, but it simply subtracted from the plot and the writers hardly dealt with it at all after Pi left for Canada.
The mirror-like ocean does not happen and neither does the glowing whale. I guess those were just added for cool affects, but they were not even that great of effects. Ok, the mirror-like ocean was beautiful, but the whale didn't look as spectacular as it could have. In fact, everything was relatively poor animation for what they were trying to achieve. And he tiger growled way too much. In the book, every single sound Richard Parker (RP) made had some emotional significance which was carefully explained to the reader. In the movie, RP just growled a lot every chance he got. It completely destroyed the relationship between Pi and RP.
The movie has RP completely under Pi's control after RP bites down on a stick and doesn't like it, whereas the book takes the time to show Pi slowly training RP, but RP isn't trained liked a circus animal until the end of the book when they are on the island. In the movie, Pi uses a stick to tap where he wants RP to go way before a relationship like that should have been formed. The movie also displays RP as being more of a two dimensional character. He growls and obeys. In the book, RP goes through an emotional journey as much as Pi does.
I also feel like Pi's character was messed up in the movie. In the book, he is not nearly as emotional in the end. At least twice during the interview section, the following words are exchanged.
"I lost my whole family."
"We're sorry about that."
"Not as much as I am."
Whereas in the movie they say:
"I lost my whole family..."
"I'm sorry."
There is emotion where there should be none. In the movie, Pi is still upset and not at all hardened by his experience. At the very end they do state that no one survived in the ocean longer than Pi, but I do not remember them stating exactly how long. I may be wrong, but I still feel like that concept was simply glossed over rather than properly addressed. The movie was more of an adventure than an emotional journey.
Now for the part that made me angry: the movie completely screwed up the carnivorous island.
The island was my favorite part in the book because it was really cool and believable. The concept was simple. Something in the algae turned the water from salt to fresh and at night, without the sun's rays, the island became acidic and digested everything that touched the surface. The fish died in the little pools because they swam into fresh water. In the movie, Pi says that every single thing on the island became acidic, including the pools and that's what killed and digested the fish. Then they do one worse thing and zoom out to see the island glowing. Immediately this scene takes the island from believable to magical. It becomes mystical rather than real.
The movie also failed to explain the meerkats. All it would have taken was for Pi to briefly state, "decades of existing on that island had bread out the fight or flight instinct. The meerkats saw no threat in us even when we attacked them." It would have taken 30 seconds at the most and helped the audience understand the island so much better. I remember the first time I watched the movie and I didn't understand the meerkats. In fact, I hardly understood the island even when Pi explained it.
I will give the movie one thing, though, I did like that they gave us as small connection with the Buddhist sailor that the Zebra represented. It helped the audience connect more with the second story, and while it was not necessary in the book, it did not take away from he movie so I liked it. Well done, movie.
Ok, that's my rant. Please keep in mind that I understand a lot of the decisions the writers made when adapting the book into a movie. All in all, it is a good movie, but not nearly as good as the book. Show the movie to your children and read the book as an adult. I have nothing against watching the movie, but as I said before, I would advise not watching it soon after reading the book. They do not compare well. If you feel like watching someone else make fun of the movie, check out this video by CinemaSins.

