[Borges]

The show didn’t last much longer after JFK was killed. It pretty much shut down production some four months later.

[Luke21]

We slammed them all and by the time they got to that last one with the kids in the swimming pool, it was bad.

[Angelino97]

The final (fourth) season (1962-63) had one hour episodes, which weren't released in the original syndication.

The show didn't work too well at that length. They felt padded.

A half hour worked better; setup the premise, then a surprise twist.