In the Book
In the Movie
Forrest meets president Johnson
Forrest meets president Kennedy
Forrest meets the President as a military hero returned from Viet Nam
Forrest meets the President because he's a college football 'all star' (an utterly stupid, banal, asinine change to the story)
Forrest meets Bubba (white guy) on the college (University of Alabama) football team
Forrest meets Bubba (black guy) in Army Basic Training
Jenny was not a striper
she becomes a striper
Forrest has sex with Jenny on several different occasions and never impregnates her, although she does end up pregnant with her husband's child, who gets sent off to Forrest as a teenager when both she and her husband mysteriously die (at the start of the second book).
Forrest has sex with Jenny just once, and as a result Jenny gives birth to Little Forrest, whom he first sees shortly before Jenny's impending death, and later raises by himself from about Kindergarten age.