What are some tell-tale economic signs/indicators of malinvestments induced by fiscal and monetary stimulus?

Economics Economics Questions
1

Are there any?

2

Inefficiency and over supply in some areas and insufficient at meeting market demand adequately in other areas.

3

For forecasting in general,

see here.

In particular, check out the interview with Frank Shostak. He essentially says the money supply is the best (and in some ways, the only) indicator.