Marshall 1Q skipped FG, turnover on downs - left points on the board
Stanford 3rd drive skipped FG, turnover on downs - left game winning points on the board.
In one of the pressers Freeman said they knew they had the wrong play on a 4th down and instead of calling a timeout they just ran with it. This was early in the season so would have been likely in the first 3 games.
Just to name a few. Small details make a big difference.