We can just imagine your thought process as you started scouring this retro gas station for clues. So many signs, so many colors, so much distraction. You probably also checked out the lady in the background to see if any of the differences were tucked away in the corner. Let's start with the hardest one for a change. Did you pick the 'one way' sign in the first image that changes to 'one day' in the second one?
If you caught the 'one way' difference you probably got the rest of them. The first gas pump has a different brand in each image. The 'G-A-S' sign hanging above the pumps changes to 'G-S-S' in the second image. Last but not least, the brands on the last pump switch around, too. Dinoco Gasoline becomes Tulsa Tea.