The "50˘" in the price logo on the front cover is purple.
The tire leaning against the wall on the front cover is solid dark gray.
The background building with the fire escape on it is yellow-gray.
The road is shaded gray using zip-a-tone.
A part of the brown overlay is missing at the top right corner of the cover to the left of the word "America", thus leaving an orange area on the wall.
On the back cover, the area that should be blue on the American flag is black.
There are no stars on the flag.
SRUCC: The Fabulous Furry Freak Brothers series
Comixjoint: The Fabulous Furry Freak Brothers Series
Comixjoint: The Fabulous Furry Freak Brothers #1, 1st printing
Grand Comics Database: The Fabulous Furry Freak Brothers #1
Don Markstein's Toonopedia™: Freak Brothers