Although Holly marries into the wealthy Anderson family, the initial on the gates of the estate where they live is G not A (film was shot on location at Greystoke Manor in Los Angeles).
Although the movie covers a 25-30 year span ending in the mid-Sixties, all of the women are dressed and coiffed in the height of mid-sixties fashions in scenes set in the late thirties/early forties.
During Holly's murder trial, an expert witness testifies that she is addicted to absinthe, a type of liquor that had been outlawed throughout the entire world because it caused insanity. In reality, absinthe did not cause insanity; the few cases were likely due to toxic additives such as copper or excessive wormwood. Additionally, absinthe was legally sold in a couple of European countries at that time (mid-sixties). In the years since, the proof that it is non-toxic have seen it legalized in many countries.
In the beginning of the film when time is flying by as depicted by newspaper headings pertaining to the couple it is announced that their son Clay VI is born. A few headlines later it is announced that their son Clay JR celebrates his 4th birthday.