Plot hole: When Lalaina is in her depressed "Bell Jar" phase, she's complaining to the psychic hotline counselor that she's freaked out by the idea of having kids because she "can't even take care of a Chia Pet". But earlier in her documentary, she'd talked about how starting at age 13 she had to become the responsible one, buying food, taking care of and parenting her siblings. Which contradicts the portrayal of her as someone who can't take care of anything.
Plot hole: Eric and Shelly were killed because they were trying to fight tenant eviction. Yet, a year later the building is seemingly abandoned. Eric and Shelly's stuff is even still there. So what were they killed for if nothing was ever done with the building?
Plot hole: When Forrest finds out he is receiving the Medal of Honor, he is addressed as PFC Gump (Private First Class, E3). "Two weeks later", he leaves Vietnam, and is then shown receiving the medal from President Johnson. In this scene, he is wearing Sergeant's stripes (E5). There is no indication or mention of him receiving a promotion, let alone two. (01:02:10 - 01:03:05)
Plot hole: By the time Lloyd gets to the airbridge the plane had already left. The finalisation of the boarding process after last call, plus push back takes at least 15 minutes. Lloyd would have easily caught up to Mary or the plane would have still been there.
Plot hole: After the robbery scene, the partner sends in the other cops and says that there is another one inside. How did he know this? No one told him, and the other robber was obscured by shelves in the door so he could not be seen.
Plot hole: During the war sequence, when Samuel dies, how necessary was it for the two Germans to go through the trouble of setting up a machine gun to shoot him? I find it hard to believe they had no other weapon but that. It seems to have been done only to build suspense. (00:42:45)
Plot hole: Harry goes into the Mall, and two of the terrorists follow him through the Mall, up the escalator, down the hall, and into the men's room. Then the third terrorist leaves the car and follows exactly the same path to where the other 3 went, even though there's no way he could have known exactly where to go.