Although he was never a Mouseketeer, Corcoran appeared in three Mickey Mouse Club serials, beginning with Adventure in Dairyland, where he played Moochie McCandless, a farmer's son.

In Disneyland: The Fourth Anniversary Show (1957), "Mouseketeer" Moochie repeatedly badgers Walt Disney for information about Zorro.

Inspired by L. Frank Baum's Oz books, the film was to star some of the Mouseketeers, including Darlene Gillespie as Dorothy and Annette Funicello as Ozma, as well as Tommy Kirk and Corcoran.

His determination to emulate elder peers despite adult warnings (swimming, helping Wilby, even switch-hitting) frequently gets him in trouble, but Moochie's bravado always returns soon afterward.

Corcoran largely retired from acting after A Tiger Walks, although he also appeared in the 1968 film Blue in a minor role.

In an interview for the DVD release of The Shaggy Dog, he credits his studio teachers with having prepared him well for his college studies.

He was an associate producer on Treasure of Matecumbe (1976), on the sequel Return from Witch Mountain (1978) and on The North Avenue Irregulars (1979).

He also served as first assistant director on several non-Disney television series, including Scarecrow and Mrs. King, Quantum Leap, Profiler and Karen Sisco; and produced a number of projects.

Another brother, Bill Corcoran Jr., former dean of students at California State University, Fresno, died in 2007.

Elder siblings Donna, Noreen, and Hugh Corcoran have extensive film and television credits as child actors during the 1950s.