When Susan and Trina are in the kitchen cleaning their clams the Mr. Coffee machine on the counter is alternately shown-hidden-shown by a wayward paper towel hanging off the under-cabinet dispenser.
While Susan and Melinda converse in the bar, the number of red straws in their glasses alternate between one, two, and none, although neither woman is seen taking a drink or touching the straws.
The characters in the episode, which is set in September 1976, refer to a deadly earthquake that has just happened in Guatemala. The earthquake in question actually occurred in February 1976, not September 1976.
In this episode, the Guatemalan earthquake of 1976 takes place on Labor Day weekend. In actual fact, the quake hit in February of that year.