First, Mime Walker's car in the Neighborhood of Make-Believe has me wanting to know more. When he places the inflatable pillow on the car's seat, the car's brand is seen quite clearly but I can't seem to find anything online anywhere about it.
Marx-a-bar? Maybe. Marx was indeed a toy company that produced ride-on cars in the 1960's. Anyone know some details about this thing? Not that I want one. I'm just curious.
Then at the end of the episode, as Mister Rogers sings with his son sitting on his lap, I can't help but think of A Christmas Story. Wearing the goggles, doesn't John remind you of the kid in front of Ralphie in the line to see Santa?
UPDATE: Thanks to some quick detective work by Neighborhood Archive reader Galen Fott, it has been determined that Mime Walker's car is a Marx-a-Cart. This battery-operated car was manufactured by Marx Toys. For images of a Marx-a-Cart, click the link posted in the comments section of this post or visit the Episode 0066 page on the Neighborhood Archive. Thanks for some fancy sleuthing, Galen!