Elwood P. Dowd's constant companion is Harvey, a six-foot tall invisible rabbit. To his sister, his obsession with Harvey has been a thorn in her plans to marry off her daughter. However, when she decides to put Elwood in a mental institution, a mix-up occurs, and she finds herself committed instead. It's now up to Elwood and "Harvey" to straighten out the mess.

A department store Santa tries to convince a little girl who doesn't believe in Santa Claus that he is Santa Claus, and winds up going on trial to prove who he is.

It's Christmas Eve, early 1930s on Walton's Mountain. As the family prepares for the holiday, they anxiously await Pa's return home from his job in the city some 50 miles away. He is late, and Ma and the grandparents hear on the radio a report of a bus accident that worries them. Oldest son John-Boy must step up to help grandfather cut down a Christmas tree, and upon learning the concern about Daddy sets out to find him.

Wealthy playboy David Sloane wrongly believes good girl Carol Corman is his best friend's mistress.