During Mack's career with the Rams, the club enjoyed a .720 winning percentage with a won-lost-tie record of 129-48-7, won their division eight times (1967, 1969, and 1973-1978), and reached four NFC championship games. In 1973, the Rams scored led the NFL with 388 points (27.7 points/game). In 1974, the Rams lost to the Minnesota Vikings by four points in the , with a controversial penalty call against Mack costing the Rams a touchdown. The Rams had the ball at the one-yard line on second down when the Vikings' Alan Page made contact with Mack; the referee called illegal procedure on Mack, but replays showed that Mack had not moved. After the game, Mack insisted he had not moved but credited Page with "a smart play" in making contact since a penalty, if called against the Vikings, would have been meaningless.