Continuity mistake: When the family arrives home from the bowling alley, it is dark and pouring rain. After the kids go to bed, Carl and Harriet go to the kitchen and talk. If you look out the windows, it's daylight.
Continuity mistake: Laura meets a guy named Ted supposedly for the first time. He is selling candy bars around the neighborhood and happens to knock on the Winslow family's door. Laura goes out on a date with him. However, Ted and Laura have already had several interactions, and have already dated and broken up in previous episodes in season 4.