Samantha takes mail out of a cute mailbox by the curb, complete with their "1164" address, but later, in the establishing shot of the Stephens house, there is no mailbox.
The Stephens' house always had a mailbox hanging on the house to the right of the door. Here, there's a mailbox at the street.
When Samantha checks the mail. The mail box says 1164. However In previous episodes the house number was 192
In the prologue the impression is given that Darrin's mother is just a couple of minutes away. "Called from the corner drugstore." Yet when Samantha does open the door she has had time to go upstairs, wash up, change her clothes and brush out her hair.