[1] In 1944, Mullen played 118 games for the Philadelphia Blue Jays (as the Philadelphia Phillies were briefly known), posting a .267 batting average (124-for-464) with 51 runs and 31 RBI, including nine doubles, four triples, four stolen bases, and a .315 on-base percentage with no home runs.

[2] Following the 1944 season, Mullen was one of many major leaguers who saw his baseball career interrupted by a stint in the United States Army during World War II.

He missed the 1945 and 1946 seasons, then attended spring training with the Phillies but did not make the team.

[1] He was married to his wife Jessie, whom he met at a high school football game, for 72 years.

[3] At the age of 96 he was the last surviving member of the Ducks' 1939 NCAA team and was one of the oldest living major league ballplayers.