When Valdez enters the bar with Max for the first time, Max pours a candlestick into the drink. In the next scene (when makes leaves the bar) it vanishes. When Max's foot gets stuck, it reappears.
The Chief of CONTROL is seen taking Dietrick and Valdez into custody, saying both will be in jail shortly. A U.S. government agent, even a service chief, would lack jurisdiction and police powers in Mexico. They would have to cooperate with and be escorted by the Mexican Federal Police (Federales), who should have been seen arresting and transporting the prisoners.
The swords used in the fight in the bell tower during the opening scene are obviously rubber.
The poster outside the cantina at the beginning says Esperanaza not Esperanza.
Barbara Feldon's lips don't match the singing very well at all.