For brain gymnastics: People who would be in the know are camera man, actors, upward chain of command, final finisher of the set. I could keep it below hundred (pm if you need next fake landing; sun costs extra)
Mission Control had 30 people in the room at a time, and each console had its own engineering room with about a dozen staff, and there were several shifts. Then there were the teams at tracking and communications stations all over the world. That adds hundreds more people at least, possibly thousands. They would all have to know the crew never actually landed on the moon.
*Sorry, silly me, six rockets over a period of three and a half years.