Carl Sagan on Johnny Carson talking about SW in 1978

I have nothing but sincerest sympathies for Carl Sagan and therefore presume that he overheard that "jump into lightspeed" was a colloquialism for the "jump into hyperspace":

HAN It looks like an Imperial cruiser.
Our passengers must be hotter than I
thought. Try and hold them off. Angle
the deflector shield while I make
the calculations for the jump to
light speed.

HAN Watch your mouth, kid, or you're
going to find yourself floating home.
We'll be safe enough once we make
the jump to hyperspace. Besides, I
know a few maneuvers. We'll lose
them!

BEN How long before you can make the
jump to light speed?

HAN Traveling through hyperspace isn't
like dusting crops, boy! Without
precise calculations we could fly
right through a star or bounce too
close to a supernova and that'd end
your trip real quick, wouldn't it?

HAN We're losing our deflector shield.
Go strap yourself in, I'm going to
make the jump to light speed.

HAN What the...? Aw, we've come out of
hyperspace into a meteor shower.
Some kind of asteroid collision.
It's not on any of the charts.

VADER They have just made the jump into
hyperspace.

 

Hmmmmmm.. Good stuff