Goofs

When riding the ore cars, the trailing car falls off, but is visible for a split second just before the final crash.

In the very beginning dream sequence, the bouquet of flowers that Mitch is holding keeps changing between shots.

When Glen accidentally catches the map on fire, the burn hole is in the center of it. Later, during the campfire scene, Mitch clearly indicates the hole being near the side.

The cooler's lid in the wagon going over the cliff.

When Mitch (Billy Crystal) and Barbara (Patricia Wettig) are in the other room arguing about Glen (Jon Lovitz) while he's reciting dialogue from "The Godfather Part II" to Phil (Daniel Stern), if you listen closely, he says "This is the business we have chosen! I didn't ask who gave the order!" followed by "Someone put a bullet in his eye!" In the actual Godfather film, the lines are reversed. Speaking about Moe Greene, Hyman Roth says "Someone put a bullet in his eye!" first, then "This is the business..." afterward.

At the very beginning of the movie, Mitch gets up at 5:16am, goes jogging with his "cow", then commutes by train from his home in New Rochelle to downtown Manhattan and arrives to work at 6:07am (see clock in background over his head). Can't be done. Correction: There are multiple clocks on the wall at work, showing different time zones, so one cannot assume the 6:07 clock is the current time, as one also says 9:07, which would make more sense.

When Mitch is about to make love to his wife at the beginning of the movie, he hides the map he just found in Curly's hat and is clearly seen removing his pants. Moments later, after ending their love making too soon, he tells his wife to go hide and jumps back on the bed, still wearing the same pants.

When Mitch removes his pants, he tosses them onto the side of the bed and when they finish, and he says the line "for you, I mean for us," he can be seen swiftly grabbing the pants, pulling them under the covers and putting them on.

Gold is a relatively soft metal. When Mitch scrapes the brick with a knife at the end of the movie, it would score.

Mitch tells Glen that Norman is a male cow, but at the beginning of the movie when Mitch is jogging with Norman he clearly has udders.

During the Stampede scene, while Mitch is trying to save Glen. If you listen closely you can hear the sound of rotors of a helicopter they're using to make the horse run.

When the map is on fire, the wind blows it around whilst the guys chase after it to put it out. However whilst they're running after it, the leaves on the trees and the bushes they run past don't move at all, proving that there is no actual wind.

At the 33:22 mark, the microfilm screen showing old newspaper articles has videotape tracking lines at the bottom.

After the night of nearly freezing and Dukes fake death, he points to the "frozen people" and Mitch looks through the telescope looking down at them. When the camera angle changes,to appear to be looking through the telescope, the angle is now looking UP at the frozen people.

When Mitch is walking to work on his 40th birthday, he passes by the Ed Sullivan Theater, which prominently displays a sign for the Late Show with David Letterman (1993). Since Mitch was born on September 8, 1952, that would make the date September 8, 1992. The Late Show didn't premiere until August 30, 1993.

After duke saves Mitch, Phil and Glen from the two cowboys they rented the equipment from duke cuts the ropes on their hands and Mitch says "Curly were so sorry we thought you were dead". However his mouth does not move.

In the shot of the train arriving at New Rochelle, the train pulls past the green 'New Rochelle' marker sign. However the train is heading in the opposite way of the writing on the sign, indicating that the train is in fact leaving New Rochelle, not arriving as implied.

Phil asks Glen who had Frankie Pentangeli killed in The Godfather Part II, to which Glen answers, "The Rosato brothers" before starting his quote from the movie. However, Frankie Pentangeli wasn't killed in the movie. The Rosato brothers tried to kill him and failed. Pentangeli later became a witness against Michael Coreleone before refusing to testify. He later committed suicide after being promised by Tom Hagen that his family would be cared for if he did so.

After Mitch brings Phil over to his house, his brother Glen does a scene from the Godfather. He recites a speech by the Hyman Roth character for Phil, but the lines are out of sequence.