They mention that in the first scene of the movie, when Indy is fleeing from the Hovito Indians, the pilot of the plane he escapes from is named Jack, and that the name of the snake Jack keeps inside the plane is named Reggie!
I'm not so certain it holds up on close scrutiny, as you can see from the following
excerpt taken from the Raider's script (which I found on-line, and have a small
portion printed here):
12 EXT. THE JUNGLE - INDY'S RUN - VARIOUS SHOTS - DAY 12
Indy runs like hell through steadily falling terrain. And always close behind, a swift gang of angry
Hovitos. Occasionally they get close enough to send a dart or spear whizzing past Indy's head.
13 EXT. THE URUBAMBA RIVER - DUSK 13
An amphibian plane sits in the water beneath a green cliff. Sitting on the wing is JOCK, the British pilot. Indy
breaks out of some distant brush and runs along the path at the top of the cliff.
INDY (yelling) Get it going! Get it going!
Jock hops in and fires up the plane's engines. Indy reaches a spot on the cliff above the place, glances
back, them jumps into the river. He comes up, swims to the plane and grabs a strut.
INDY GO!
Jock starts the plane moving across the water as Indy walks across the wing and falls into the passenger
compartment.
14 OMIT OMIT 14
15 OMIT OMIT 15
16 INT. JOCK'S PLANE - DUSK 16
Indy relaxes and lies across the seat, a big smile on his face. One hand drops to the floor of the cabin and
Indy jumps, hitting his head. On the floor of the cabin is a huge boa constrictor. Indy tries to get his whole
body onto the seat. Jock sees what's happening.
JOCK Don't mind his. That's Reggie. Wouldn't hurt a soul.
INDY I can't stand snakes.
JOCK The world's full of them, you know.
INDY I hate them.
JOCK Come on now, Sport, show a little of the old backbone.
17 EXT. JOCK'S PLANE - TWILIGHT 17
It soars off over the dark jungle.
As you can see from this excerpt above, the true name of the aviator in this opening scene of Raider's is JOCK, not Jack.
Now, it IS possible that the name of this character is a portmanteau one (that is, two words
smashed together to from one). If this is the case, it is possible that someone deliberately designed
it such that JOCK= Jack + Doc, as a form of sly in joke or homage..
Further evidence for such a connection would be if it was public knowledge that Steven
Spielberg was in fact an ILAM fan. I have a strong and dirty hunch that George Lucas was, if the opening segment of
"The Radioland Murders," which he produced, is any indication (that segment had had the signature opening of
ILAM, the Fleishmann's Yeast advert, and so on)..
But I have never heard or read anywhere that Mr. Spielberg was a fan of the radio
series.
If anyone can find a reference to that effect, I'd be VERY interested to see/read it!