I stopped by the drive-thru at the newest In-N-Out Burger by my house and ordered a cheeseburger and fries, both animal-style. At the pick-up window, the staffer asked if I wanted grilled onions on my animal fries, and I confusingly said "yes" (e.g., it's not animal style without the grilled onions). However, when I got home, there were no grilled onions.

Making animal fries typically involves multiple staff members: it starts with the fry person adding cheese to the fries and melting it, the griller (often a manager or assistant manager) adds grilled onions, the burger wrapper adds the spread, and lastly, the drive-thru person briefly checks to confirm everything is correct. This is standard.

Animal-style burgers: mustard on the meat, grilled onions, extra pickles, cheese, and spread.
Animal-style fries: cheese, grilled onions, and spread.

This is the first time I've seen In-N-Out Burger mess up my order out of ignorance. It happened at a new location, which tells me the staff (including the manager) don't know what animal style means.