This happens in the scene where Don Rafael returns to California after Don Diego (Zorro) has escaped from jail.

He is greeting all the other Dons that have gathered to greet him. He greets them all by name ("Don Pedro", "Don Julio", etc.)

When he gets to Don Hector, Don Hector, instead of greeting Don Rafael by his name in return, says "Hi, Don Hector"!

So not only is he giving a 21st century greeting in a 19th century movie, he is TALKING TO HIMSELF.

I have a DVD of the movie, and it bugs me every time I see it!