How can the continuum of strategies be used inappropriately in the classroom?

Answer 1

Rushing through lessons too fast for students to understand is one way.

What else can you think of?

Answer 2

If you want to know the theory behind second language acquisition, as well as strategies for students to be successful, be sure you're very familiar with Prof Stephen Krashen's work:

http://www.sdkrashen.com/SL_Acquisition_and_Learning/index.html

Read through the chapters that are linked at the left.