Tex Avery used long limo gags in his cartoons and Bob Clampett does the same thing in “It’s a Grand Old Nag” (1946).
It has a sunglasses and an Oscar hood ornament. The sunglasses remind me of Clampett himself in photos from the late ‘40s and early ’50 when he was producing A Time For Beany.
The topper gag is when the limo turns a corner, it turns out to be fake, with Charlie Horse (Stan Freberg) churning the pedals while director Retake (Dave Barry) does nothing because he’s Important in Hollywood.
I doubt Bob Clampett had a phoney limo but I’ll bet he had cash-flow problems like other cartoon producers of the time. This was the only short he made under a deal with Republic.