Barnaby JonesGoofs
Factual errors
The police cars used in the series are not often of the type used in the Los Angeles Police Department during the 1970s.
Miscellaneous
Occasionally a car may run off a cliff or crash and then explode. Gasoline is volatile but not explosive, so there is no reason for the cars to explode.
Character error
Barnaby is renowned for his scientific ability. However he has a habit demonstrated several times of blowing into the evidence bags to open them up. This would contaminate anything he put in the bag.