In the Book
In the Movie
Forrest curses a lot.
He doesn't swear.
Forrest has a low IQ, but he proves himself to have savant like ability when it comes to physics.
He has a low IQ.
Bubba is with Forrest at University.
They meet while in the army together.
Jenny leaves Forrest and gets married to another man. She raises Forest Jr. with that man. She lives.
Jenny marries Forrest and dies.
Forrest leaves the Shrimp business to travel around with his Ape and Lt. Dan as a one man band.
Forrest leaves the Shrimp business to Lt. Dan and goes home to cut the grass for free.