Uncle Sam's pants go from red and white to black and white just before the final showdown.

When the dramatic red-lit close-ups of the congressman's hands being strapped to the fireworks tower are shown, it's apparent that the arms are being stretched up and away from the waist, as in a crucifixion. When we see the congressman full length, however, his arms are tied down at hip level.

Cannon balls like those being fired from the cannon by Jed do not explode, let alone explode a half dozen times as Leslie's home did.

A class is shown in session in July, despite the fact that the overwhelming majority of American schools are not in session during July, and the classroom holds a rather large amount of students for it to be a summer school class.

When Sam is blown away, the support wires are visible. In fact, when his body leaves a hole in the house, the wires also leave a linear hole in the house.

When Uncle Sam is shot towards the end of the movie, the gun used on him is a six shooter, yet it fires 8 bullets.

During the interior casket shot starting at 35:56 Uncle Sam's eyes can be seen moving even though he is supposed to be deceased.

Near the end of the film when Jody and Sam are in the house talking, twice you notice a crew member or someone sitting on the couch.

Barry, who is supposed to be blind, takes the food given to him by his parents at the Fourth of July rally without any verbal prompt, as if he can see it.