I don't know, maybe playing Redmond and Tadic on the wrong wings, or taking umpteen games to realize he needed a goal scorer (Austin) up front and to replace the statue in goal with someone who could actually move. Or making random substitutions that make no sense, rather than ones that counter the other teams changes. Or taking a solid 8th place/Cup final squad (which was strengthened with Lamina and Hoedt) into the relegation zone.
It's subtle things like that I guess.