If you look very carefully, you will notice that the arsonist is driving a different Ford station wagon in several of the scenes. The car is the same color but the wheel covers are different! One wagon has a pie pan shaped wheelcover, the other has fake mag wheel type wheel covers!
(You have to be a true Ford fan of the 60's to catch this!)
In the closing credits, the Angeles National Forest is identified as the filming location. This is the only FBI episode that shows a location in the credits!
Erskine & Rhodes stalk a psychopathic pyromaniac into an inferno that threatens to become a funeral pyre for them all.
Lynda Day George is billed as Lynda Day.