Both episodes 56 and 51, aired in the second season, were remakes of episodes 14 and 15 from the first season. In both cases, one scene was added and one scene was deleted or shortened, in order to turn both 56 and 51 into flashback episodes.
A Comparison on Episodes 14 and 56
EPISODE 14 begins with Samantha arranging flowers in the living room. There is a crash, as Aunt Clara falls down the chimney into the living room. Samantha helps her to her feet and guides her to the sofa. They sit and talk about Clara's visit.
END of Teaser.
Darrin greets his parents at the airport.
EPISODE 56 begins with Samantha in the kitchen feeding Tabatha. Darrin enters with a letter for Tabatha [ her first]. The letter says that Darrin's parents are coming to visit in two weeks. Samantha and Darrin talk about the disaster the last time Darrin's parents visited when Aunt Clara was there. This leads to a fade-in for the flashback. The flashback begins with Samantha seating Aunt Clara at the sofa. Their conversation is identical to episode 14.
A New Scene to an Old Show in 56
End of Teaser
Darrin greets his parents at the airport. The rest of the episode is identical to episode 14.
DIFFERENCES: In episode 56 the scene with Tabatha is added and part of the arrival of Aunt Clara is cut.
A Comparison on Episodes 15 and 51
EPISODE 15 begins with Samantha entering the entry wearing a white coat and carrying some packages and a purse. Darrin enters wearing a robe. He asks Samantha about the Christmas tree. Samantha tells him there was a $ 5.00 delivery fee, but she got the tree home. Darrin offers to get the tree as soon as he gets dressed. Samantha reminds Darrin that they are due at the orphanage in a half hour. Darrin exits upstairs. Samantha removes a small tree from her purse and zaps it to a full size tree.
END of Teaser.
Opens with a scene of the orphanage. The Kravitz's arrive. Interior scene of the orphanage. The Kravitz's greet Mrs. Granger, the manager. The Kravitz's then go over to meet Tommy.
EPISODE 51 begins the same as episode 15, and is the same through the end of the teaser.
END of Teaser
Begins with Darrin coming downstairs, dressed. He starts to go out after the tree, but finds it is in the house. He fusses at Samantha for bringing the tree in "in her condition." He gets even more upset when he finds she zapped it in to the house. During this conversation, Samantha removes her coat revealing that she is pregnant. Darrin then produces a Christmas card from Michael, the boy from episode 15, and they discuss last Christmas leading to a fade out and the start of the flashback to the previous Christmas. The flashback begins with the scene of the orphanage and the Kravitz's arriving. The scene with the Kravitz's meeting Mrs. Granger is cut up to the point where the Kravitz's meet Tommy. The rest of the episode is the same as episode 15.
A New Scene to an Old Show in 51
DIFFERENCES: The scene with Darrin fussing about Samantha bringing in the tree, and Michael's Christmas card is added. The scene where the Kravitz's arrive at the orphanage and greet Mrs. Granger is cut.
The edited version now shown in syndication usually omits the teaser, and begins with the scene of the orphanage and includes the Kravitz's meeting Mrs. Granger. This defines it as episode 15, since this scene was cut from episode 51.