In the first scene in which Eddie, the radio deejay for KNBL/KFWB appears, his hair is blonde, but the very next time he appears, his hair is red.
When Wilma tries on her ballet costume her hair style changes and when she tries on the next costume it changes back.
When Wilma drives the family car it has a canopy, but when Fred drives it, the canopy is missing.
When the Wayouts arrive at the radio station, their manager states that the station name is 'KFWB' while the sign above the door clearly shows the letters 'KNBD'.