In one of the final episodes... where Wilbur gets the motorcycle to make Ed jealous....

The neighborhood kid that gives Wilbur the idea... rides up to the house with a girl on the back of his bike.
She has no lines so hense no credit (there is a close up though.)

Her hair is slightly blonde and long, but it sure looks like Barbara and it would have been about a year before Get Smart started where she became famous as 99.

I remember the ep. It certainly wasn't Barbara Feldon. And BTW that Ed-ep was on the same season Get Smart premiered, I believe. 1965-66 season.

that Ed-ep was on the same season Get Smart premiered, I believe. 1965-66 season.

Maybe she has twin sister? ;)

You're right Get Smart did start in 65 I was thinking it was a bit later as except for the Pilot they are all color which generally wasn't the case until 66-67. (Most entire first seasons were B&W then only to color if popular after about 64)

Then again it was on NBC which started all color much sooner than CBS and ABC.

PS The last season of ED might have been color, but for its early time slot.
That was the year My Favorite Martian went color in its last season, but aired an hour later than Ed and followed Lassie which had been color for a few years I think.