Blame it on Rio is nicely crafted fluff. Valerie Harper was great in one of her few big screen roles. Demi Moore was nearly non existent and bombed with both this and No Small Affair in 1984.
I must admit that if, at that time, you had asked me who would become a big star: Michelle Johnson or Demi Moore, I wouldn't have said Demi Moore. Shows how much I know about career prospects in the movies!