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Incorrectly regarded as goofs
The horizontal stripes on the right sleeves of uniforms are Overseas Service Bars not Service Stripes. One bar is authorized for every six months in a combat theater. Service Stripes are diagonal and worn on the left sleeve. One stripe is authorized for every three years in service.
Both the soldier at the wedding and Michael when he returns have one stripe and six bars indicating three to five years of service with three years in combat.
The level of Michael's beer while he is leaning against the post at the wedding reception goes up after he drinks.
The deer that Michael kills in the hunting scene is not the same species as the one that is strapped to the hood of the Cadillac when the hunting party arrives back into town.
In the first hunting scene as they're changing their clothes, Michael and Stan are arguing about Mike's boots. Nicky is seen putting on a sweater and had both arms in when it cuts back to Mike who delivers his "This is this" lines. When it cuts back to Stan and Nicky, Nicky is once again putting the sweater on as if it was never on in the first place.
In the bar before Nick, Steve and Michael are going off to Vietnam, Nick opens up the same can of beer twice.
In the scene at the VFW hall where they are playing bingo, the guy calling out the numbers on the winning card calls B-15, but when the board comes into view showing the numbers that had been called, B-15 is not lit up.
When Michael comes back from Vietnam, he has a full beard while in uniform. The army would not have allowed him to leave Vietnam in uniform until his haircut and facial hair complied with uniform regulation AR 670-1.
Mike wears the green beret of the U.S. Army Special Forces operator. He is dressed in Special Forces tiger stripe camouflage in Vietnam. However, in full dress uniform, his left shoulder sports the 101st Airborne Division badge.
When Michael goes back to Vietnam to find Nick, it is obviously in April 1975 as the fall of Saigon is depicted. At Nick's funeral, Angela's son is no more than two years old, yet Angela had yet to give birth when Mike, Nick and Steven left for Vietnam. That would mean they went to Vietnam in 1973, however, all American troops were withdrawn from Vietnam by March 1973.
Steve and Nick, while depicted as assigned to 101st Airborne Division, they were shown wearing Marine's M1955 flak vest with a rope ridge on the shoulder.
In race scene with truck, a state of Ohio route sign is seen on a pole.
The horizontal stripes on the right sleeves of uniforms are Overseas Service Bars not Service Stripes. One bar is authorized for every six months in a combat theater. Service Stripes are diagonal and worn on the left sleeve. One stripe is authorized for every three years in service.
Both the soldier at the wedding and Michael when he returns have one stripe and six bars indicating three to five years of service with three years in combat.
When hunting, Michael carries a left handed Winchester Model 70 rifle, with the bolt handle on the left side. However, in one shot during the second hunting scene, the bolt handle is suddenly on the right hand side. His wristwatch is also on the opposite wrist. The editors apparently flipped the negative so that he would be facing the right direction to match the other shots in the sequence.
When Linda goes to Mike and Nick's trailer for the first time, the trailer's hitch as well as the tail lights can be seen. The wires from the tail lights are seen running into the windows above the hitch. The tail lights should be on the rear while the hitch is on the front.
In the bar scene at the beginning of the film, a supposedly live football game on the TV is obviously film, complete with many scratches on the image.
When Nick and Steve are trying to stop Michael from attacking the green beret guy at the wedding ceremony, at one point the two empty jugs get knocked by Steve's shoulder and they fell, Nick briefly decides to make them upright again but changes his mind, and then in the next take they are upright again like nothing has happened.
The hairstyles the men wear in the first scenes in the film, which are set in 1967, are anachronistic for their location, occupation, and socio-political orientation. While male hippies and rock musicians famously had long hair in 1967, it was unheard of for patriotic steelworkers in Pennsylvania to wear their hair that long. Hair for that set of people is perfect for 1975, when the last scenes are set, or 1977-78, when the movie was filmed, but not for 1967.
When returning to the bar after the hunting trip, they are singing "Drop Kick Me Jesus (Through The Goalposts Of Life)" a Bobby Bare song released in 1976 after the Vietnam War had ended.
When Nick enters the red-light district bar in Saigon, "Midnight Train To Georgia" by Gladys Knight and the Pips starts playing on the loudspeakers. However, this recording was not released until August 1973, at least four years after this event could have occurred.
The cans of Rolling Rock beer, Iron City beer (in the 1960s Pennsylvania bar), Pepsi and Mountain Dew (at the wedding reception), and Miller beer (in Vietnam) are all 1970s vintage. The bottles of Rolling Rock do, however, roughly represent the correct 1960s design.
When the group breaks out the food during the hunting trip circa 1968, the food packaging is clearly of late 1970s vintage, with bar codes.
During a brief moment, the whole camera crew becomes visible in a shop window.
Towards the end, when Michael is going to find Nick, and they are on the boat, there are 'explosions' in the distance; however they appear to be some kind of flame-making machine belching fireballs up into the sky. If you watch closely you can see two pipes at the base and after a set period, they 'fire' again.
The hunting scenes supposedly taking place in the Allegheny Mountains are obviously filmed elsewhere. The Alleghenies are a smooth rolling range, but the scenes show towering, jagged peaks. The scenes were filmed in the Cascade Range, clear across the country in Washington state.
The deer that Michael shoots is an Asian Red deer which is not indigenous to North America.
When Angela looks at herself in the mirror wearing her wedding gown, a mic hanging over her head is also reflected in the mirror.
"Stosh" is the Polish nickname for Stanley, not Russian.