There are only two Mr Ed episodes that I've been able to confirm that are in the public domain. ""The Wonderful World of Wilbur Pope" and "Wilbur Gets the Message... About Savings Bonds".
However given the convoluted nature of copyright law at the time & the relative slipshod way renewals were handled there may be others.
Episodes that were properly renewed are controlled by MGM; however, some episodes were not renewed and have entered the public domain.
Mister Ed is a horse of course!
The duration of Mister Ed is 1800.0 seconds.
Yes, "Mister Magoo's A Christmas Carol" is in the public domain since it was released in 1962 without a copyright notice. This means it can be freely distributed and used without permission.
Mister Ed ended on 1966-02-06.
Mister Ed was created on 1961-01-05.
Mister Ed - 1958 Mae West Meets Mister Ed 4-21 was released on: USA: 22 March 1964
Mister Ed - 1958 Jon Provost Meets Mister Ed 5-25 was released on: USA: 9 June 1965
Mister Ed - 1958 Leo Durocher Meets Mister Ed 4-1 was released on: USA: 29 September 1963
no
Mister Ed - 1958 is rated/received certificates of: USA:TV-G
Mister Ed - 1958 Ed Gets the Mumps 4-13 was released on: USA: 5 January 1964