The movie is set in the early 1880s. When the settlers open their cash box to show Baxter and Hawley the money they've been promised to escort the settlers to Silverado, we see the 1886 Martha Washington $1 silver certificate, the 1917 George Washington $1 legal tender note, the 1907 (or 1922) Michael Hillegas $10 gold certificate, and the 1907 Andrew Jackson $5 legal tender note. The 1917 Washington $1 is distinguishable from other issues by two indicators: the small red seal on the left, and the serial number below the seal, which is not in a dark gray box. The 1907 Jackson $5 is distinguishable from other issues by two indicators: the small red seal on the right, and the small red Roman Numeral V on the left. The 1907 (or 1922) Michael Hillegas $10 gold certificate is distinguishable from the 1922 Ulysses Grant $50 gold certificate by the shape of the white shirt in the portrait at center, and by the lower-right corner border around the encircled number.
'Float' glass is used in window glazing throughout the film, a flatter more uniform
glass made in large sheets by a modern industrial rolling process not available at the time. Glass used in 1880 Silverado should be wavy 'cylinder' glass of the period. Cylinder glass was made by hand blowing glass into cylinders which are then cut down the side in a straight line when cooled, reheated and flattened out into small panes with noticeably irregular surfaces.
Pane glass is shown being used throughout the film. However, this wasn't available in large quantities until the early 20th century 20-30 after the setting the of the film. Any glass used in Silverado should be wave type of glass.
During the showdown in Silverado, Emmett is shot in his right leg, in a spot visible from most angles. After racing the horse to another end of town, and killing him, there is a shot of Emmett on the horse where you can see almost his entire right leg, and no bullet hole is visible, either in his leg or pants.
When Emmet is caught by the deputies, the second lasso catches him around the ankles. In the next shot, this rope is up around his thighs and his feet are free, and then in the next shot the rope is back around his ankles.
Jake's paint horse changes throughout the movie. There are at least three paints that he uses. When the little boy is rescued by Jake and Emmett, the horse's rump coloring changes from the time the little boy looks down to Jake and when he jumps from the roof top to land on the horse.
When Slick looks for Rae and discovers Stella's secret hideout, he runs to it and looks out towards the street in front of the tavern. You can still see people walking around, even though everyone cleared the streets when they heard a shootout was about to occur.
When Paden shoots Cobb, the wide angle view shows Cobb starting to spin to his left. In the solo shot immediately after that, in addition to a pause that should not be shown as Cobb reacts to the bullet hitting, he spins the other direction before falling.
While saving Augie from McKendrick's ranch, when Emmett jumps through the window, the gun of the bad guy holding Augie isn't cocked. When the camera angle changes, and Emmett shoots him, his gun is now cocked.
In the final conflict scene when Jake is riding bareback on his Pinto into town to confront his nemesis, his reins are tied in a knot. When he arrives at the hitching post in town, however, the reins are draped loosely over the Pinto's back.
As Rae is coming down the stairs to talk to Mal when they see each other for the first time, her dress has a ruffle across her shoulders, flapping in the breeze. She talks to Mal and the camera cuts between them,and also has a side view. When the camera cuts back to her, the ruffle is neatly tucked into her shawl without her having adjusted her shawl at all.
The town of Silverado is a busy, bustling place with people everywhere on the streets and sidewalks even though views from far away reveal that it is tiny, in the middle of nowhere, and with no ranches or farms in sight.
Making his escape from the jail Danny Glover's character throws a knife with his thick arm stuck through the bars and kills the deputy instantaneously with a deeply penetrating knife wound to the chest. The throw angle has been cheated to make it look like he has room to freely throw the knife making the throw trajectory nearly parallel to the jail cell bars when in reality the entrance door the the deputy enters the room through is directly opposite, perpendicular to Glover's position in his cell. Glover couldn't have drawn his arm back far enough to impart much force to the big knife. The knife would have had to been thrown with great force in order to break or slice through the bone of the deputy's rib cage/sternum and penetrate deeply enough into the heart or lungs to inflict a fatal wound. This type of wound isn't instantly fatal as portrayed, exsanguination would take minutes, the deputy would not hit the floor instantaneously upon impact of the knife. He would be animate, still breathing and writhing until eventually losing consciousness from blood loss or drowning from blood accumulating in the lungs.
Jake and Emmett's brother-in-law and sister, in the closing scenes, are wearing bandages over their injuries. Emmett, however, in spite of being shot with a rifle in the upper leg (maybe even shattering his femur?) is completely fine.
Emmett is left handed throughout the movie. In the shootout at the end he has the gun in his left hand and the very next scene he gets shot in the right leg and his gun drops out of his right hand instead of being in the left hand where it was prior.
After saving the wagon trains money from the gang in the canyon, Emmet, Paden and Mal are sitting on horseback talking as the wagon train moves from right to left behind them. One wagon can be seen with the wagon tongue clearly broken and being dragged behind the lead team. The only way the team is attached to the wagon is by the reins in the drivers hands.
The goof item below may give away important plot points.
When Mal's father is accosted by the river and fatally shot, it is daytime. Mal is then shown at night when he hears the shot. He races to his father just in time to see the killers leave and is daytime again.