25 people doesn't sound like a fan film? Have you seen one of the bigger fanfilm crews when they are shooting? The Tressaurian Intersection
cast and crew easily numbered into the 20s.
The point is that the line of too many people is relative. If the "set" is small that doesn't mean you don't need people, it just means that you move the people who don't need to be near the camera off-set to your basecamp. When I shot in a 70 year old flying boat we had a basecamp set up outside the plane, and the only people inside it were those who needed to be there at that moment. Makeup comes in, does touchups then exits, stage right, etc.