I posted this somewhere else already, but whatever...
Maiden did not play in front of 250,000 people at Rock In Rio in 2001. The full capacity of the venue was 250,000, but "only" 150,000 were actually allowed in for safety reasons (Bruce even stated that in an interview, I'm not sure where to find it). If you pay attention during the DVD, you will notice there's quite a bit of space at the back.
Furthermore, even if the capacity of the 1985 Rock In Rio venue was 350,000, and even if that many people showed up, it is -at least for this issue- important to note that Maiden were not the headlining band. Headliners of that festival were Queen, so it is very likely that most people came to see Queen, not Iron Maiden -unlike in 2001, when Maiden actually were headlining.