The trailer for “Argo” balances two different tones, according to Mr. Garrett: thriller and Hollywood satire. “Thrillers have a very fast cutting style,” he said. “It’s a way of ratcheting up attention.” Shots are longer, on average, when the trailer turns to satire.
Interesting also to learn that scenes not included in the released feature are sometimes added to the trailer for no particular reason. Here I was thinking that happened because final cuts, but not trailers, might vary from country to country for whatever reason.