Rivers was constantly scrambling around behind the line trying to direct traffic and call multiple audibles taking up so much time that he ended up with some delay of game penalties. When he did get the play off in time it was usually with a second or two before the play clock expired giving the defense ample warning about when to key off and begin the rush, which as a result was very effective.
You could sense the confusion in the rest of his teammates as soon as the play started. That is no way to run an offense and is almost always destined to fail. QB's have to have confidence in the huddle, calling the play quickly, getting their team to the line and if an audible or two are needed, call them quickly without a lot of running back and forth and pointing at folks.