When Oberman pulls his car to the side of the road to shoot at Stephen Edwards, the front license plate on his car is Maryland KLV-538. However, when he walks to the rear of his car to retrieve the crossbow from the trunk, the ending digits on his license plate are -4500 (the first few letters aren't visible).
As Jennifer, Stefanie keeps her fingernails rather short. The fingernails on the hand that's picking up the telephone receiver are much longer.
When Oberman is confirming Jennifer's identity, he's holding a yearbook photo, the school name is "Hillsdale High School.' But in the season 4 episode "Harts on Campus,' Jennifer's reunion is at Gresham Hall.
At the paddock, Steven tells Jennifer that her horse had a foal, that it was a boy. The foal seen is obviously female.
When Jennifer is hesitant about showing Jonathan old pictures, she mentions an "H" on her cheerleading sweater. It's known that Stefanie Powers went to Hollywood High School. It would be odd for Jennifer to go there for high school, living in Maryland.
When Stephen, Jennifer and Jonathan are walking down a hallway into a bedroom, the configuration matches the upstairs hallway of the Hart's house.
When Jennifer is looking through an old photograph album, she turns two pages. There are two pictures on each page, both pictures on each page are identical.
Near the beginning of the episode, Jennifer is heard greeting a caller before she has picked up the receiver.
The Harts' plane lands at Dulles then they travel to MD by car. As the plane lands, you can clearly see CA hills/desert behind the plane and while in MD, California geographical features are everywhere.