Other mistake: In the very last scene of the movie, and just before Blondie shoots the rope that is holding Tuco on the grave's cross. You can see a car moving in the background, screen right of Tuco's head.

The Good, the Bad and the Ugly (1966)
Ending / spoiler
Directed by: Sergio Leone
Starring: Clint Eastwood, Eli Wallach, Lee Van Cleef
Blondie, Tuco and Angel Eyes have a standoff in the cemetary. Blondie kills Angel Eyes and, with the help of Tuco, finds the gold in an unmarked grave next to the grave of Arch Stanton. Blondie loads half the gold on his horse and leaves the other half for Tuco. He also leaves a noose. Tuco stands on a grave marker while his head hangs in the noose as Blondie and his horse gallop away. Just as it seems Tuco will fall and hang himself, Blondie turns around and shoots the noose, causing Tuco to fall to the ground. Blondie heads off into the sunset, leaving Tuco with half of the gold and his hands tied behind his back, in the middle of nowhere.
Monty
Man With No Name: The way I figure, there's really not too much future with a sawed-off runt like you.
Trivia: Eli Wallach actually did get a black eye during his torture scene (but thankfully nothing more).
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Chosen answer: Tuco knew he had a better chance at survival (and the gold) by playing along with Blondie and keeping his balance on the cross, hoping Blondie does not miss the rope when he shoots. This final, deadly game was preferable to being shot outright by Blondie and dying a poor man.
Scott215
Tuco had no idea that Blondie's intention was to shoot the rope and let him live.