Forest has a lot of back story, but because he is "a bit slow", it's important to be able to tell which of the stories he is telling are "his" and which are stories in which he placed himself in a role. In order to do that you need to understand some popular history and what Forest would have seen on TV or heard on the radio.
Not having ability to tell what is real and what is a bit off won't make the move unenjoyable, it will still be a "feel good movie" about a guy doing some really amazing stuff.
But in the end, you take all the times that you know Forest didn't do the things he said he did, the times you think he might have done the things he said he did, and the times that you are pretty sure he's telling you what he actually did, and you compare them, all to realize it doesn't matter. The people on the bench still were interested, Forest still feels good about himself and you as the viewer still feel good about the stories.
That examination of why, is what makes Forest Gump a good movie. In my opinion. Why do you feel good, watching stories where you know some of them are totally wrong, and that the guy telling them is wrong. Ask yourself this. Would you feel the same way if Forest Gump was not "slow"?
Anyway back to the question. Yes, you need at least some understanding of American history and General culture to fully enjoy the movie. Not having that, you will miss out on a lot. But the understanding required is nothing more then the ability to go "that seems unlikely" in a few cases to get the effect, and that's a pretty low bar.
Again to get the full effect you just need enough to go "Hmm that seems off" a couple times, and "Nope, that can't be" a couple times. That hardly requires much of an education in American history or culture. What you can pick up off the TV is probably enough.
15Quite interesting question and I disagree with closevote reasons. – Ankit Sharma – 2017-01-16T07:26:24.433
13I think this answer would depend on how separated you were from US culture. As a Brit with no particular interest in US history, I think I pretty much understood it all. A Martian, on the other hand, may have struggled. – Tetsujin – 2017-01-16T07:31:02.727
10Go ahead, watch the movie, and if you need some explanations that you can't find on the internet, ask them here ;-) – Silver Bebs – 2017-01-16T08:26:37.253
3Even if you don't know anything about American history, this movie could be a gateway to learning about certain events in American and Global history, and expanding your general knowledge. – Vahx – 2017-01-16T12:23:48.197
1To expand on Vahx's comment, I would recommend this: Watch the movie. Use that to learn about a few things that interested you, and watch it again. – krillgar – 2017-01-16T13:03:01.503
2Go ahead watch, i am indian who knows outside world from movies only. I too enjoyed Movie. – Panther – 2017-01-16T15:56:14.973
21"... to enjoy Forrest Gump" - whether you enjoy it is a matter of opinion. A little less subjective would be to ask if it's necessary to understand the plot. – Oliver_C – 2017-01-16T21:54:52.600
I think it would safe to say that you would enjoy the movie more if you knew some American history/culture to understand the various backstories. – MaxW – 2017-01-17T00:17:44.517
1@Oliver_C I had the same thought, but "plot" isn't quite comprehensive enough--most of the references (the footage of celebrities and historical events, the music selection, etc) aren't really part of the "plot" as such but are a large part of the "flavor" of the film. (OP: there's no guarantee you'll like the film; I'm a reasonably well-educated and culturally literate American, and I more or less despised it. But I hope your experience is better!) – Kyle Strand – 2017-01-18T00:25:58.883
You can certainly enjoy the movie without that knowledge, but you probably couldn't fully appreciate it as it was originally meant to be appreciated. – Michael – 2017-01-17T19:43:31.790
@KyleStrand - whether the OP will enjoy the movie more because he understands the references depends entirely on his preferences. E.g. the "Apple" reference, if you don't like the company, it might actually make you cringe instead of smile. Or "Elvis", some might not like the revelation where his dance moves come from, ... - What we can answer is relevance to the plot, what we can't answer is what the OP will enjoy. – Oliver_C – 2017-01-18T09:56:57.403
@Oliver_C I think you've misunderstood my comment; I agree that we can't predict OP's level of enjoyment of the film. However, we can still make objective statements about elements of the film that aren't included in the "plot". – Kyle Strand – 2017-01-18T15:05:15.667
only tangentially related but there's an older movie that has a similar theme you might find interesting (simple man unintentionally inspiring people).
– gman – 2017-01-19T05:32:44.997