Continuity mistake: During the long wedding scene, while Michael watches Linda on the dance floor, the level of the beer in his glass goes up and down several times.
Continuity mistake: In the scene where the boys are changing into all their hunting gear on the side of the road, keep an eye on Christopher Walken. In a wide shot, he's pulling on a dark green sweater. There's a quick shot of De Niro, then back to the wide shot, in which Walken is again pulling on the dark green sweater.
Continuity mistake: When Michael and Linda are walking outside the Eagle Supermarket, there is a man pushing a shopping cart. At first the man is far away from the corner of the building, when it cuts and the man says "How is it going hot-lips?" he is right by the corner. (01:56:45)
Continuity mistake: When Michael and the guys get back to the bar they pour drinks in their glasses. The amount in the glasses suddenly increases. (02:00:55)
Continuity mistake: After Michael returns from Vietnam for the first time, he goes for a walk with Linda. As they start to pass in front of a store with a guy outside, Michael is shown fiddling with the collar of his coat. The shot changes, and though from their position and reaction of the guy outside it is supposed to be a direct continuation, Michael suddenly has his hands buried deep in the pockets of his coat.
Continuity mistake: When Nick is killed during the final Russian Roulette game, the gunshot wound on his bandana changes from the bottom to near the top between shots.
Continuity mistake: When the car vs. lorry race occurs near the beginning of the film, as the car pulls in front the left wing of the bumper clips the lorry and gets noticeably misshapen. Then the shot changes, the car spins round, comes to a halt, and the damage has gone (and remains so for the rest of the film). Possibly made worse by the fact they then make a big thing of Nick actually getting out the car and inspecting it for damage in a disbelieving fashion that anyone could have pulled it off without damaging it.
Continuity mistake: When the boys are on the side of the road ready to go hunting, Stan is complaining about Michael's way of flirting. Michael is holding his rifle with one hand, but a frame later he is holding it with both hands.
Continuity mistake: Near the beginning when Meryl Streep is getting her father dinner she puts a napkin in the collar of her dress. She goes to the range to fill some soup and it disappears.
Continuity mistake: When the movie starts all of the friends go out to a bar. The pool ball changes position depending on the angle.
Answer: De Niro is a US army ranger sporting the special forces identification badge on his shoulders. There are many inconsistencies in the uniform though.
lionhead