Each team is allowed 60 formal interviews of players at the Combine. Each of those interviews are limited to 15 minutes. It doesn't leave a lot of time for formalities -- but it does provide enough time for some tech-savvy teams to show players' video clips of their play from last season.
The New England Patriots are one of a handful of clubs asking players to explain their play off video, according to scouts and coaches I've spoken to over the past few days. The Patriots were credited by opposing teams as being the first they knew who had implemented the use of video in these short interviews.
Typically, the team would break the 15 minute interview into roughly two portions. Approximately seven minutes for a question and answer session, with the other seven or eight minutes devoted to breaking down game film from the season. Players are asked a multitude of questions by coaches during this film time, including what was the player's initial responsibilities on the play, what were the responsibilities of players around them, why they were successful (or not) on the particular play, etc.
Some teams I spoke to felt that the this was an inefficient use of time. After all, this practice is popular during private visits teams have with players in the weeks leading to the draft.
I disagree entirely.
I believe that asking a player about he and his teammates' responsibilities on successful and unsuccessful plays is an excellent way to ascertain the prospect's knowledge of his own position, his scheme, recognition of the opponent's plans -- and perhaps most important -- get an indication about the player's accountability and ability to take criticism.