At the three outfield positions he showed good range, finishing in the top five in range factor per nine innings five times, and his strong arm was rated as one of the best in the league. He also played a solid first base late at his career and his competitive attitude was highly praised by teammates and opponents. Despite his skill in the field, which saw him finish in the top 5 in the American League in outfield assists three times (1961, 1962, and 1965) and outfield putouts twice (1959 and 1963), he also produced many errors and Allison led the league with 11 errors in 1960, finished second twice (1959 and 1963), and finished fourth in errors by a first baseman in 1964.