With theater & film production questions. : )

1. A round theatre has people on both sides and in the front while a proscenium theatre only has people in the front. Both theatres are shaped like spheres, but the 'round theatre' has more overall space, and the sides are open instead of closed off. 
2. They can change the design of the set pieces, get more crew members for set movement, or figure out how to make the pieces easier to move.
here are two, sorry I just got kind of busy, in about 15-30 min I will come back on and add more!!