I watched the Trailers fro the 3 GFs before. GF III's trailer is standard hollywood fair. GF II is good. But GF I is basically 3-4 minutes of just linear narration, telling everything except a few key plot details.

My question: What's the deal with the trailer for GF I? and was there somekind of renaissance in trailer making between 1972 and 1974 that caused these two trailers to turn out so different?