Harrah was noted for his good eye at the plate, placing in the top ten in the league for bases on balls on nine occasions, including an AL-best 109 in 1977. He finished his career with more bases on balls than strikeouts, with 1153 and 868, respectively. He also had better than average power for a defensive infielder, hitting 195 career home runs. Combined with good speed, he accumulated three seasons of 20 home runs and 20 stolen bases. Harrah's on-base skills and respectable slugging ability led to a solid career Adjusted OPS of 114.