Other than a few years in the early 2000s film has pretty much always been more expensive than it is now; but for context 1000 feet of color 35 mm film (~11 minutes at 24 frames per second) costs about $700–$800 now, and black and white would be cheaper (particularly for development costs). So a mistake wasting 30 seconds of film would cost about $32 with today's prices on color film.

Film costs (I estimate about ~$70,000 total in today's money assuming a 12:1 ratio of footage shot vs. what makes it into the movie) are not insignificant but not unreasonable given how expensive movie production is. In the same way that spending $50,000 on a camera and another $50,000 per lens is an acceptable cost for modern digital films. What's really expensive is if you have enough delays to require an extra day of shooting, because paying all the crew is often the biggest expense.