At the beginning of the movie in what turns out to be Willow's funeral, a shot of Wildman shows him in Dress Blues. At the end outside the chapel just before Willow's casket is moved to the burial site Wildman is seen in Class A (green) uniform.
When Sgt Goody Nelson reads the Army Digest, re Wildman's award of the Medal of Honor, and opens it for Hazard to read, the date of the citation is 1966, even though the film takes place in 1968 and 1969.
The name tags on uniforms are white US Army changed to subdued (black letters on olive drab tabs) in 1967, but in 1969 all soldiers are still wearing the old style.
Although the movie is set in the late 1960's (1968-1969) Anjelica Huston is seen riding on the Tour Mobile Tram, which did not start operating in Arlington National Cemetery until 1971.
Sgt. Major Nelson isn't wearing the National Defense Service medal ribbon. Created in 1953, he should have it and a star attachment denoting his service during Korea and Vietnam.
The flag on Willow's casket is improperly positioned while it sits at the altar in the cemetery chapel. The blue field should be at the back left corner of the casket (the blue field is always over the deceased's head, and the deceased's head is always to the left)
Much of the conversation in the film centers around how busy the Old Guard is because of the casualties from the Vietnam War. In truth, there are comparatively few Vietnam era graves at Arlington. Most soldiers were buried in their home towns. More Vietnam veterans were buried at Arlington after they died later in life than actual combat deaths.
In the beginning funeral scene, when the soldiers are folding Willow's flag, you see they are folding the blue field first, going to the red and white stripes. In the next scene, a pull-back, they are folding the flag stripes first. When a flag is folded, the blue field is always last so the triangle shows stars in a 1-3-5 configuration.
The actor playing Wildman is too short to have been a member of the Honor Guard. The requirement back in the 60s was to be at least six feet tall. Wildman is no where close to that height in the movie. Later the regulations may have been amended when women were allowed to serve in the Guard.
During the funeral for Second Lieutenant Willow, SFC Clell Hazard removes his CIB (Combat Infantry Badge) and places it on the coffin. Later, it is back on his uniform. Military badges are available for purchase at the post Clothing Sales Store and easily replaceable; Hazard would have done so immediately after placing his original on Willow's casket to be in proper uniform for the burial.
Willow is congratulated on becoming an officer. He is presented a paper saying he is now a 2nd Lt., and he is given a bar for each shoulder to signify his rank. A 2nd Lt does not simply wear "a shoulder strap without bars" since the US entry into World War I in 1917. A 1st Lt's rank is signified with a single SILVER bar on each shoulder strap; a 2nd Lt's rank is signified with a single GOLD bar on each shoulder strap.
During the scene of the Changing of the Guard you see the Tomb for the Unknown Soldier from the Vietnam War. This would not have been in place until after 1980, yet the Movie is set in the late 1960s.
The movie is set in 1968, but in the parade ground scene, the extras in the crowd clearly have 1980s-era hairstyles.