Here is a summary of facts about the original 26 episodes of Jonny Quest from the 1964-65 season on ABC. The titles are listed in broadcast order, with their production codes, working titles when known (and where different from the final title) and the original and repeat air dates listed in TV Guide issues from that era.

I've begun adding information about the original, national commercials that aired on Jonny Quest during its 1964-65 season. I'll post more information as I receive it.

The Mystery of the Lizard Men
Z-3, 9/18/64 (Friday, 7:30 p.m. Eastern), not rerun in season.

Arctic Splashdown
Z-5, Splashdown Antarctica, 9/25/64, 4/8/65.

The Curse of Anubis
Z-2, 10/2/64, 6/3/65.

Pursuit of the Po-Ho
Z-7, Po-Ho Adventure, 10/9/64, 4/1/65.

Riddle of the Gold
Z-4, 10/16/64, 4/22/65.

Treasure of the Temple
Z-9, The Lost City, 10/23/64, 3/25/65.

Calcutta Adventure
Z-6, 10/30/64 (orig. scheduled 10/16/64), 7/1/65
Commercials:
For July 1, 1965, repeat:
Brought to you by: ABC, Donna Reed Show (10 seconds)
Between Parts 1 and 2:
ABC's Wide World of Sports (60 seconds)
Between Parts 2 and 3:
Quaker Puffed Rice (30 seconds)
Aunt Jemima syrup (30 seconds)
Between Part 3 and end credits:
ABC's coverage of Major League Baseball, promo'd in song by the King Family singers. (60 seconds)
ABC's The Addams Family. (8 seconds)

The Robot Spy
Z-10, Dr. Zin's Robot Spy, 11/6/64, 5/6/65.
Commercials:
For Nov. 6, 1964 original broadcast (probably):
Brought to you by: The Big G Cereals of General Mills (10 seconds)
Between Parts 1 and 2:
Cheerios (30 seconds)
Lucky Charms "The new oat cereal" (30 seconds)
Between Parts 2 and 3:
Beechnut gum/candy (60 seconds)
Between Part 3 and end credits:
P.F. Flyer shoes, featuring Jonny Quest and Race Bannon (60 seconds)
P.F. Flyer shows, live-action (10 seconds)

Double Danger
Z-1, 11/13/64, 5/27/65.
Commercials:
For Nov. 13, 1964 original broadcast (probably):
Brought to you by: The Big G Cereals of General Mills (10 seconds)
Between Parts 1 and 2:
Lucky Charms "The new oat cereal" (30 seconds)
Cheerios (30 seconds)
Between Parts 2 and 3:
Trix (45 seconds)
Frosty O's, featuring Tennessee Tuxedo and Chumley (15 seconds)
Between Part 3 and end credits:
P.F. Flyer shoes, featuring Jonny Quest and Race Bannon (60 seconds)
P.F. Flyer shows, live-action (10 seconds)

Shadow of the Condor
Z-8, Condor, 11/20/64, 4/29/65.

Skull and Double Crossbones
Z-12, Bahama Treasure, 11/27/64, 7/8/65.

The Dreadful Doll
Z-11, Suga Doll, 12/4/64, 6/24/65.

A Small Matter of Pygmies
Z-13, 12/11/64, not rerun during season.

Dragons of Ashida
Z-14, 12/18/64, 4/15/65 (postponed from 3/18).

Turu the Terrible
Z-15, 12/24/64 (now on Thursday nights*), 5/20/65.

The Fraudulent Volcano
Z-17, 12/31/64, 8/12/65.

Werewolf of the Timberland
Z-18, 1/7/65, 7/22/65.

Pirates from Below
Z-20, Underwater Probe, 1/14/65, 5/13/65.

Attack of the Tree People
Z-16, Tree Boys, 1/21/65, not rerun in season.

The Invisible Monster
Z-19, 1/28/65, 8/5/65.

The Devil's Tower
Z-21, The Devil's Escarpment, 2/4/65, 8/19/65.

The Quetong Missile Mystery
Z-26, 2/11/65, 9/9/65. Later retitled "The 'Q' Missile Mystery."

The House of Seven Gargoyles
Z-22, 2/18/65, not rerun in season.

Terror Island
Z-23, Chu Sing Ling Caper, 2/25/65, 7/29/65 (rerun postponed from 7/15/65).
Commercials:
For July 29, 1965, repeat:
Brought to you by: ABC, The Addams Family (10 seconds)
Between Parts 1 and 2:
ABC's coverage of Major League Baseball, promo'd in song by the King Family singers. (60 seconds)
Between Parts 2 and 3:
ABC's Where the Action Is show (60 seconds)
Between Part 3 and end credits:
ABC's The Addams Family. (10 seconds)

Monster in the Monastery
Z-24, (may have been The Monsters in the Monastery,) 3/4/65, 8/26/65

The Sea Haunt
Z-25, 3/11/65, 9/2/65.