The record we have today of Apollo is vast, far larger than any of the hoax theorists contemplate. So I agree that it would be prohibitively expensive and difficult to fake that record. But let's say we wanted to fake a manned mission to Mars within the next 15 years. Would we be able to do it convincingly?
Well, we already have some relatively recent examples, at least, of how the Mars video side might be faked.
1. Mission to Mars. A terrible Mars sci-fi movie with turgid dialog and a far-fetched but nonetheless interesting take on the Cydonia
"Face on Mars" rubbish. However, it had some good effects, and IMO, its sole redeeming feature was the Zero G dancing scene, the main reason being that they danced to Van Halen's
"Dance the Night Away".... Awesome!
2. National Geographic's MARS A better effort, badly let down by having the astronaut actors interact with each other in exactly the way that astronauts don't, and having the astronauts doing really dangerous, stupid and risky things that no astronaut would ever, ever do. Too much licence taken with the science for dramatic effect.
3. The Martian The best of the three, most of the science was realistic with the one glaring exception (the dust storm) on which the whole premise was based. The CGI was excellent, and astronauts acted like real astronauts.
All three however, fail on a single important aspect.... gravity. Even today, 50 years after Apollo, it still seems impossible to film live action actors walking and operating in low gravity. Mars' gravity is just over 1/3 that of Earth. Although people working on Mars would be doing so in a little more than twice the gravity of the Moon, as they walked, worked and carried out tasks on Mars, they would still look more like what astronauts on the moon looked like, than what they would when filmed in the 1G of Earth's gravity.
Gravity is going to be the dead-giveaway of a fake