I don't think anyone has ever noticed this movie mistake.
At the end of Spider-Man (2002), Mary Jane Watson knows that Peter Parker is Spider-Man. She encourages him to keep being a hero by saying, "Go get 'em, tiger", INSTEAD of the much more logical, "Go get 'em SPIDER".
So either there was a huge typo in the script, or we're supposed to believe that MJ has no understanding of the differences between arachnids and mammals! It makes NO sense!