Continuity mistake: When they are in the park, Roger is sent to the phone booth to call Jeannie, but ends up having a conversation with the operator. When Dr. Bellows pulls up, the phone booth is empty. Yet, a few minutes later, Roger is shown still in the phone booth. Because he mentions the original reason for his call, it is clear that this is supposed to be the same conversation.
Plot hole: As Jeannie is walking down the aisle with Dr. Bellows, she sees the first photographer about to take a photo. A second before the photo is snapped, she blinks in the mannequin, which can be photographed. Later, though, when Jeannie and Tony are watching the film of The Wedding, the mannequin is not visible, either. In the film, the photographer can be seen snapping that first photo (at this point, Dr. Bellows is walking down the aisle with the mannequin), but the film still shows Dr. Bellows walking down the aisle alone.
Visible crew/equipment: At the beginning of the episode, Jeannie is talking on the phone by the stairs and her sister is hiding behind the banister. Her sister stands up for a moment and shows her full face, revealing that it is actually Barbara Eden's stand-in wearing the green costume.