From the description of another Youtube video:
https://m.youtube.com/ watch?v=QYhPy14dTGA
[...]
Jason Merrick (an expert on Captain Kangaroo) identifies the people as; Marcia Wallace, Lynn Redgrave (as Miss Dandelion), Mary Tyler Moore, Stu Kerr, Bob Newhart, Dick Shawn, Tony Orlando and Dawn, Dinah Shore, Fred Rogers, Roberta Peters, Betsy Palmer, The Hudson Brothers, Stubby Kaye, Margaret Hamilton (as a Fairy Godmother), Pearl Bailey, Alan Alda, Chad Everett and James Daly from Medical Center, Imogene Coca, King Friday, Isabelle Sanford, William Shatner, Brett Somers, Charles Nelson Reilly, Julie Harris, Gene Rayburn and Johnny Olson, Richard Dawson, Fanny Flagg, the cast of The Bob Newhart Show, Sandy Dennis, Eli Wallach(as Trader Eli), Allan Sues, Dick Shawn (as E. J. Fussy), Celeste Holm (as Mother Goose), Lucie Arnaz, Larry Linville, Artie Johnson, Gwenn Verdon (during her second appearance) and her cat Fattrick, Peter Bonerz, Alan Arkin, Edie Adams (as Little Red Riding Hood), Cher, Edward Villella, Earl ' The Pearl' Monroe, Gary Burghoff, Lady Elaine Fairchilde, Clifton Davis, Godfrey Cambridge, Suzanne Pleshette, Doug Henning and Anne Jackson.
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